Recycling plastic is essential for the well-being of our planet. Before plastic can be recycled, it must be sorted and separated, either at source or at a recycling facility. This article gives simple guidelines to easily identify different types of plastic in line with the international plastic identification code.
Learn how to solve problems on different types of depreciation methods in Engineering Economics using the formulas and solutions provided.
Coral bleaching is an event in which corals lose their pigment and main source of food. It often causes corals to die. Oxybenzone in sunscreens may contribute to coral bleaching.
Involving many principles of science, this particular paradox follows a consequence of black hole mechanics and has far-reaching implications, no matter what the solution is.
The anesthesiologist monitors, and responds to, changes in your vital signs during your entire surgery. Heart rate, rhythm, blood pressure, oxygen level, breathing and other parameters give the anesthesiologist the information needed to keep you safe and comfortable during an anesthetic.
Landfills are the method of choice for disposing of the world's garbage. By means of a comprehensive chart, you will be able to learn about fifteen of the largest landfills in the world.
Stages in the Life Cycle of Stars - From protostars to white dwarfs, neutron stars, black holes and supernovae. The stages in stellar evolution are described.
Daffodils are beautiful spring flowers that have a wide variety of colours and shapes. Yellow daffodils are often used by cancer societies as a symbol of hope.
Keeping your favorite recipes organized is a challenge for many of us. Create your own recipe database and never have to hunt for your recipes again.
The arctic wolves are the least understood or studied wolves out of all the species of wolf on the planet. Living in only the most remote and extreme environments, these predators brave the cold.
Basking sharks are the second biggest fish in the oceans, and are to be found in all temperate seas of the world. Harmless plankton eaters, basking sharks spend their summers slowly swimming around on or near the surface of the water with their mouths open, filtering plankton and small fishes from the seas. In winter, they dive to great depths in the deepest oceans where they continue to feed off plankton from the foot of water columns.
This is the fourth page of a series of guides to the night sky for beginners. Here, I look at the most prominent objects other than our Moon and the stars, which can be easily seen in the night sky.
What makes the Cretaceous sea worse than any other in history is that there isn't just one predator to worry about, but a whole collection of them, including sharks, lightning fast killer fish and fearsome giant marine reptiles called mosasaurs.
What are the most dreadful earthquakes of India. Below is the list of biggest earthquakes of India with images.
Unripe lychees and ackee fruits contain toxins. Both fruits should be eaten only when ripe. In addition, it's very important that ripe ackee is prepared properly.
Dinosaurs get all the glory. Their appeal often overshadows other species that existed with them. Non-dinosaur fossils reveal rare glimpses into reptiles, birds and mammals when T. Rex ruled.
What are Decibel levels and why are they so important? How can you measure them and when are they too "loud"?
Because of human destruction of their habitats, species whose geographical range is small are at the greatest risk of being endangered. Here you'll find a list of ten of the most endangered animals.
So, there's a flat Earth society, a round Earth society, but why have we eliminated the possibility of the Hollow Earth?
What different species of animals can interbreed and how is it possible? From mules to ligers learn all about hybrids in this comprehensive article.
About 74,000 years ago, a volcanic explosion on the island of Sumatra threw so much ash into the atmosphere that all human life may have been threatened.
A detailed guide explaining everything you need to know about the water cycle, processes and the different types of rainfall all explained with beautiful diagrams.
Six lithium-ion battery types are compared to one another with respect to specific energy, specific power, performance, lifespan, safety, and cost.
Eurasian Eagle Owls have made a comeback in the UK. Discover some interesting facts about the Eagle Owl; behavior, reproduction, habitat and why the Eurasian may become threatened again.
Space exploration is dangerous business. Despite hard training and dedication, these ten astronauts perished before making it into outer space.
Our skin is an impressive organ that has many functions. For example, it reduces water loss, fights infections, helps regulate body temperature, and makes vitamin D.
This article offers a list of 10 lakes or seas that are in danger of drying out to a great extent or disappearing entirely in a period of decades or years.
We might not be able to clone dinosaurs but did you know we are looking into "reverse engineering" them? And cloning more recently extinct animals?
Narwhals are strange and fascinating Arctic whales. The males—and sometimes the females—have a very long tooth that grows through their lip, forming a tusk.
Varanus salvator, the Asian water monitor, is one of the most accessible large lizards on Earth. If you know where to look, one can get up close and personal with these giants of the reptilian world
With such extreme physics already at play, can we hope to understand the process behind black hole mergers?
My list of the most dangerous animals in the USA, where I name the animals which are most capable of injuring and, in rare circumstances, killing people.
Bumble bees have surprisingly capable brains. They can play a simple version of soccer and pull a string to get a reward. They may even experience optimism.
Snakes are fascinating reptiles that have a wide variety of appearances and behaviors. Some snake characteristics are both strange and surprising.
The monkey puzzle tree is a very strange and interesting plant. It's native to South America but grows in parks and gardens in other areas as an introduced plant.
Birds are among the most beautiful creatures on Earth. They're also some of the weirdest! Check out these crazy-but-true interesting and fun facts about our feathered friends...you'll be amazed!
Asian and African golden cats are beautiful animals whose populations are near threatened. The cats are in trouble because of human activity in their habitat.
Man has always been fascinated by the sky. Yet space exploration in earnest did not begin until the 20th century. A recap of man's remarkable achievements in search of new frontiers.
What are the world's rarest and most endangered butterflies? This quick and easy guide tells you all about these beautiful and critically imperiled insects.
Fascinating facts and photos featuring the most common and some more unusual stones found along Lake Michigan's shorelines. Including various types of basalt, septarian brown stones, limestone, granite, gabbro, diorite, gneiss, schist, sandstone, silt stone, mud stone, geodes, chalcedony and agate.
This hub explain how do we use c++ bitset class to represent binary numbers and check individual bit fields in it.
Marmots are large ground squirrels that live in mountainous areas of British Columbia. They are social and very vocal animals that often form colonies. Three species of animals are commonly known as marmots in BC. One of them—the Vancouver Island Marmot—is critically endangered.
The cheetah is one of the most iconic animals in the world. The cheetah doesn't get the respect or media attention the lion does, but there are only ten thousand left in this world. Save the cheetah.
Spiders both fascinate and frighten people. Check out these weird, amazing, interesting and fun facts about spiders taken from science, history, literature and mythology with cool photos and videos.
Goldfish are interesting fish that have some surprising features. The animals are popular pets. They are found in the wild, where they may become very large.
The queen bee is the mother of the honey bee hive. The life cycle of the queen bee and her affect upon the hive is fascinating. These FAQ will explain all.
Take a tour of Prokaryotes: The most numerous organisms on our planet. Complete with quizzes, videos, links and summary tables. Excellent for A-level and higher
The hedge bindweed or morning glory twines around other plants and interferes with their growth. Bindweed produces large and beautiful flowers in summer.
Find the best facts about echinoderms right here! Ten fun facts for whatever your needs! You'll be learning about Echinoderms in no time!
TLC chromatography or thin layer chromatography is an analytical technique for easy identification of photo-constituents.
A compound shape is a shape that is made up from other simple shapes. In this article we will be working out the area of a L shape (made up from 2 rectangles). To find the area of a compound shape, follow these simple steps: Step 1: Work out the...
In this article, we are going to see the usage of C-Sharp ThreadPool. We will also see an example which demonstrates creating threads through ThreadPool.
Learn to identify songbirds by type and see pictures of common backyard birds. You might be surprised to discover how some of the birds you see in your garden and yard are related. They are all of the order Passeriformes, but then split into many different families.
This article is all about the characteristics of the Pine tree, the adaptations that help to survive winter, reproduction through cones, and uses. Read on to know more.
Formic acid is found in the sprayed venom of some ants and the secretions of some stinging nettles. The acid is dangerous at high concentrations but has important uses.
The Spix's macaw is endemic to Brazil but has been declared extinct in the wild. It still exists in captivity. Captive birds may be released into the wild, but it's unknown whether this will restore the population.
What is the rarest blood type? This is an important question since blood transfusion has become a big part of modern medicine.
The difference between the colossal and giant squid, the real sea monsters that spawned the kraken legend, is about more than just size!
Hellebores bloom mainly in late winter and spring. Their flowers are an attractive and welcome sight in nature, gardens, and landscaped areas. Lenten and Christmas roses are both types of hellebores. Many other species and cultivars of hellebores exist, offering gardeners some interesting choices.
Nuclear decay results in the emission of three different types of radiation. Each of these types has different qualities, which contribute to their industrial uses, some closer to home than expected!
There are so many different types of crabs around the world. Find out more about these fascinating animals here.
Mud is a versatile and interesting material. It's useful for both humans and animals. It can also be dangerous, especially in the form of mud volcanoes and mudflows.
Mother Nature is repeating herself. Is she having senior moments? Losing her marbles? Learn more about plants and fungi that look like body parts: brains, fingers, toes, eyes, and private parts.
Puffins are most people’s favourite sea bird, and Scotland has plenty of great places to view them. Whether you are a visitor or native to Scotland, this article shows you where to go. And it’s filled with cute photos!
A complete list of all the sharks found in the Mediterranean Sea, with a separate list of sharks dangerous to humans.
Giardia is an interesting parasite that causes an unpleasant intestinal disorder called giardiasis. Understanding the parasite's features and behaviour may lead to better treatments for the disorder.
Barium is an elusive element with not many industrial uses when compared with other metals such as aluminum. However, from a medical drink to rat poison, it would be inaccurate for one to say it didn't have an interesting array of applications.
There are many different types of plants, ranging from grand trees to tiny algae. This is an overview with pictures.
The catnip herb is a type of catmint. It has culinary uses and is also used in traditional medicine. Some cats become very excited when they smell the plant.
The different types of shark that fill the oceans are fascinating animals. They have been around a long while but are still top predators...
Buttercups and daisies are attractive wildflowers and a lovely part of summer. Daisies have edible parts that can be used in salads, but buttercups are toxic.
Sinkholes are scary and sudden. But are they really deadly? Is there anything we can do to prevent them? A look at recent US and Worldwide deaths, why sinkholes happen, and how to stop them.
Hunting for morel mushrooms in Southern Oregon is well worth the effort. Here is a guide for those who love to hunt morels and hike in spring in the woods.
The constellation Virgo is one of the oldest-named constellations. It has a great mythological history and hundreds of galaxies and "Messier" objects within its boundaries. Find out more about the "Diamond of Virgo" and the "Field of the Nebulae."
Mother Natures uses colors in weird and wonderful ways. You can see this in the eyes of people with Heterochromia iridum, people with two different colored eyes.
Understanding percentages and learning how to calculate them is a fundamental skills of mathematics. This articles describes how to calculate a variety of types of percentages that are used in our world each and every day.
The orangutan is one of our closest relatives, and yet we know comparatively little about them. They are an animal, that we need to learn more about, because maybe knowing more about them will helps us understand ourselves better. Hopefully, we can do this before it's too late...
This is a full guide in finding the general term of sequences. There are examples provided to show you the step-by-step procedure in finding the general term of a sequence.
A straightforward guide to drawing graphs in KS3 and GCSE science coursework and exams. Points out common pitfalls and shows a step-by-step guide to drawing these mark-rich answers perfectly
Guide to the different tests you can perform on unknown bacteria to identify it. These methods are really important in many fields when you are faced with an unknown sickness or contamination.
Mudskippers are unusual fish that may spend more time on land than in water. They use their pectoral fins as legs and breathe through their skin as well as their gills.
Learn how bird feeders impact wild birds and the environment so you understand the good and bad aspects of feeding the birds in your garden or yard.
Tsunamis are a natural disaster with devastating effects. Here you'll find a detailed breakdown of what causes a tsunami, which is perfect for school projects and essay answers.
Al-Biruni a pioneering Muslim scientist figured out a truly remarkable and ingenious method to calculate the radius of the earth (and subsequently its circumference etc.). This was very simple yet accurate requiring just four measurements in all to...
Fun dry ice experiments. Make foggy bubbles, screaming metal, frost things over, pop the caps off containers, blow up a balloon, and more.
Understanding the construction and general functions of the nervous system can assist in identifying the nervous system's role on human behavior.
The longhorned tick is native to East Asia and has been introduced to the United States. In some parts of the world, it transmits microbes that cause disease in humans. Its population is increasing in the U.S. It hasn't caused health problems in the country yet but is being monitored carefully.
Is it possible to travel through time? Perhaps it will be in the future, but a lot of technological hurdles must be overcome before time travel can become a real possibility.
Our world is filled a multitude of geologic hazards that can cause extensive property damage and even loss of human life. Mass wasting is one of those hazards that can be avoided or mitigated if you are prepared. Learn about the different types of mass wasting and what causes them.
Originally from Africa, the Guinea fowl has been become popular in many countries, not only as a food source but for some of their unusual and quirky habits.
A detailed visual tour of the eukaryotic plant cell. Complete with videos, quizzes, links and summary tables. Excellent for A-level and higher.
Scolopendra cingulata is the name of a particularly dangerous centipede that lives in Europe, around the Mediterranean basin. Be very wary if you spot one, because they can bite and leave a nasty reaction.
The only naturally occurring poisonous spider in Maryland is the Black Widow spider. Learn how to identify several other spider species, their habitats, behaviors, and what you can do to deter them.
Take a closer look at microscopy! Learn the differences between an electron and light microscope, know your resolution from your magnificaiton and learn how to correctly use a microscope.
Everyone know about the physical differences between mean and women. But why are they different anatomically? The answer lies just below our skin in our blood and other cells in the body.
The Jerusalem cricket is an interesting insect with bizarre looks that can be pretty frightening, but as long as you don't provoke them unnecessarily, they won't bite - and they aren't poisonous.
When we think of meat-eating plants, The Little Shop of Horrors often comes to mind, but there are many different carnivourous plants. Some "swallow", like Audrey II, others function differently.
Learn about the different types of computer languages and how they are different from one another. Compare their advantages and disadvantages.
Snakehead fish are invasive species in North America. They are fierce predators and can breathe in air. They may be a serious threat to native wildlife.
There are supposedly dozens if not hundreds of poisonous herbs that grow around the world. Doctors and pharmaceutical companies warn us about these herbs..yet some of these herbs are used in our meds.
Many slugs play a helpful role in their environment, although some are pests. Researchers are hoping to create useful items based on slug slime and movement.
Cinnabar is a beautiful but toxic red mineral made of mercury (ll) sulfide. It’s used as a source of mercury and to make an artist's pigment called vermilion.
Honey bees are very smart despite having tiny brains. They can learn; they have good memories, and they can communicate using a unique symbolic language.
Chloroform can act an anesthetic, but it’s toxic and causes serious health problems. There are ways to limit our exposure to the chloroform in the environment.
This article answer the questions: "What is Physics?" and "What are the branches of Physics?" Learn about what physics is and its many different branches.
Ferns are attractive plants with interesting features. They exist in both wild and cultivated forms. The western sword fern is a common and often impressive plant in coastal British Columbia.
Mitochondria are cell organelles that produce energy for our body. Damage to their DNA and genes can cause a mitochondrial disease, which may be serious.
Anyone who has ever tripped and fallen knows that gravity works. The question is, how does it work for plants. What makes plants grow up and roots grow down? Geotropism is the answer.
Have you ever discovered a snake in the wilds of Indiana and wanted to be able to identify it? Use this dichotomous key, which includes the most common physical characteristics of adult snakes.
An awfully subjective topic, but take a look and see if you find something you never knew existed. Our solar system has plenty to look at.
Antibiotic resistance in bacteria that cause disease is a serious problem. Soil contains many bacteria, some of which may help us by making new antibiotics.
Having a surgical biopsy taken can be traumatic. Waiting for results adds to the stress. Here is a step by step description of how biopsy tissue is processed in the histopathology laboratory.
Most people confuse bees, wasps, and hornets, but there are several significant differences between the three. This article was written to educate you about those differences.
Finding the modal class from a grouped frequency table is actually quite easy to do. All you need to do is to look for the group that has the highest frequency. This is because the mode is the number that comes up the most times. Make sure you write...
Where are the world's supervolcanoes? The Western United States, Italy, New Zealand, and Asia all contain volcanoes capable of catastrophic eruptions.
The great horned owl is an avian apex predator. Possibly this bird is the finest predator to have ever lived.
Parasites are everywhere. They live on your skin, in your hair and even inside you! Some are harmless, many are necessary for health, and a few are DEADLY. Let's find out more about crazy PARASITES...
Russia's domesticated silver fox experiment gives genetic clues to the process of animal domestication. Wild foxes from fur farms have been domesticated and made available for the pet trade.
Pyrosomes are strange creatures that swim in the ocean and are bioluminescent. They are undergoing a puzzling population increase off the west coast of North America.
Fishing cats are wild animals that feed primarily on fish and are at ease in water. Unfortunately, their population is in trouble due to habitat destruction.
Researchers have found that people with osteoarthritis seem to have a lower than normal level of FOXO proteins in their damaged joints. Increasing the protein level might help to treat the disease.
If you have red hair or blue eyes, then you're a mutant. There's nothing you can do about it except read this page to find out why nature selected you for mutantdom.
My attempt to satisfy the question 'Can Life Exist in the Sirius Star System'. I hope you find it educational and enjoyable as I did doing the research
Discover the biggest sharks in the world! Do they really deserve to be feared? Read this before you head off to the beach!
This article suggests a list of the thirteen greatest airplanes of all time, emphasizing the importance of each during its time and place in world history.
The tallest and longest mountain ranges, with pictures. The world's tallest mountains are in central Asia; the world's longest ranges are on other continents. Geology of mountain ranges.
An illustrated guide to some of the best-smelling flowers in the Hawaiian Islands. Includes colorful pictures and resource links.
The astrolabe has been used by mariner's for centuries. Although its use has largely fallen by the wayside due the development of more sophisticated instruments such as telescopes and GPS, it is still an instrument worthy of study. Build your own simple astrolabe to determine your latitude as did the ancient sailors or use it in conjunction with trigonometry to determine the height of a very tall object!
A genealogy timeline can help you organise your family history and open up new lines of enquiry. Learn how to create a genealogy timeline to uncover more of your family history.
Land subsidence caused by groundwater withdrawal poses a significant threat to governments, businesses, and the general public.
This guide shows you the math behind working out a bolt circle diameter (BCD) or pitch circle diameter (PCD) and gives tables you can use in your calculations.
A redox reaction is a reaction that involves both oxidation (the loss of electrons) and reduction (the gain of electrons). In order to identify whether a reaction is redox or not, you can write separate half equations that show how electrons are...
Often thought of as impenetrably difficult and complex, Physics explains the inner workings of the Universe...and your wireless network...and boomerangs...and electricity. This hub looks at ten of the best questions asked of me this year.
Second Beach at Port St John's, South Africa, has earned the reputation of being the most dangerous beach in the world for shark attacks, after suffering 6 fatalities in just six years.
If you see yellow garden spiders in the landscape, don't squash them! Be thankful. Argiope aurantia are large, bright & beautiful beneficial predators. They are also a sign of healthy garden ecology.
Its hard to find a simple answer to the question, How long do ants live? It could depend on caste, habitat, diet, and a lot of other factors that differ from one species to another. Ants have been around for at least 100 million years, and to this day there are at least 12,000 different ant species.
The lamprey is a frightening eel-like parasite, but could they really attack humans? Here's a look at this monster of nightmares.
Whether you enjoy hosting fun parties or want a creative way to make your science presentation come to life, here are easy instructions to bake a scrumptious, scientifically-accurate animal cell cake.
The large or Malayan flying fox is one of the world's largest bats and has a wingspan of up to six feet. Its population is classified as Near Threatened by the IUCN.
Simple question, but no simple answer. The easternmost point in the US is up for debate. The location of the first sunrise in the US depends on the season. While West Quoddy Head is the easternmost point in the continental US, it only sees the first sunrise 34 days a year. Cadillac Mountain on Mound Desert Island sees it first in the winter. Mars Hill Mountain sees it first in the summer. Mount Katahdin, the highest point in Maine, never sees it first.
65 million years ago, a massive asteroid crashed into the Earth. It wiped out 70 per cent of all life, including the most successful, the dinosaurs. But what if the asteroid had missed? What would the world be like today, if the dinosaurs had survived...
Working out the odds of an event occurring allows us to estimate the number of times that event will take place in future trials. Permutations/combinations are also an important part of the analysis.
The reactions of matter whether occurring in natural processes or in the laboratories can be interpreted using another language of chemistry – the equation. A chemical reaction transforms one or more substances into a set of different substances. The substances that enter into a chemical reaction are called reactants and the substances formed are the products.
How is form related to function? How does primary structure influence tertiary structure? What is the secondary structure of a protein? What is tertiary for that matter? This hub answers these questions and more.
The emerald ash borer is an introduced insect in North America and is a very serious pest. At least sixty million ash trees have been destroyed so far by this beetle.
There are many extinct animals that once lived in the rainforest, and many more that are endangered. We, who have the best capability of protecting these animals, should take actions to preserve life.
The resins that some trees secrete when they're wounded can be useful for humans. Some are used as perfumes or medicines. Others have preserved ancient life forms.
Among natural hazards and disasters, earthquakes are the most dangerous and disastrous happenings on the earth's surface.
A growth or a culture medium is composed of different nutrients that are essential for microbial growth—here are some that are used in microbiological laboratories.
Roses are beautiful and often fragrant flowers that have inspired gardeners for many years. They produce a useful oil and tasty fruits called rose hips. The flowers have many symbolic meanings.
The heterozygote advantage is shown in several genetic diseases: cystic fibrosis heterozygotes are resistant to cholera, thalassemia trait confers a benefit for coronary artery disease.
Buchholz relay is a type of protection relay universally used on all oil immersed transformers having rating more than 500 kVA. From this article its principle and working can be understood.
Pacific white-sided dolphins are intelligent and very social animals. This article describes the lives of the wild dolphins and of some rescued animals in captivity.
Biting Midges are notoriously difficult to eradicate, but there are steps you can take to minimize their impact.
Electrolysis is the process in which a chemical reaction is started with electricity (Andersen). This is usually done with liquids and especially with ions dissolved in water. Electrolysis is used widely in today's industry and is a part of the...
To work out a fraction of a number all you need to do is divide the number by the denominator of the fraction and multiply this answer by the numerator. Example 1 Work out 3/8 of 48. First of all divide 48 by the denominator: 48 ÷ 8 =...
Scores of people tinker in basements and garages trying to make the next big thing; sadly a lot of the effort only produces strange inventions that nobody needs.
Lithium is never found in its pure state in nature because of its highly reactive nature. It can be found as a component of minerals and salts present in rocks, springs and in brine water of the oceans. Read on to know more about Lithium.
Do you understand your blood results? Why do doctors need to know what's in your blood? Read this article to find out - in language you can understand.
This article aims to answer some tricky chemistry questions I have come across in my experience as a high school teacher: What is an acid? How do fireworks change color? How do glow sticks work?
The grid method is a great fool proof method to help you with multiplication. As long as you follow these simple steps and have good knowledge of place value and your timetables this is a great method
The rapid development of land for use by humans all over Asia poses a serious threat to many animal species, and many Asian governments do too little too late to protect their own environments.
Paper chromatography is a type of planar chromatography which can be performed faster and in an easy way. It is useful for detection of components in a mixture.
The bunya pine produces huge and often very heavy cones. Its large seeds are both edible and tasty. The tree has a strange appearance and some unusual features.
A solar flare in 1859 caused power spikes and disrupted the world's telegraph system. How much damage could a massive solar flare do to power and communications today?
The density, mass and volume triangle is as follows: So if you wanted to work out the density, you would cover up density in the magic triangle to give: Density = Mass/Volume (since mass is above volume) So if you wanted to work out the...
The notorious Ring of Fire, which runs all the way from New Zealand to Chile by way of the Aleutian Islands, is home to many of the most potentially destructive volcanoes on the planet.
A handy guide for identifying various types of clouds including information on what makes clouds look different, which are responsible for storms, and how some clouds can help in predicting weather.
Find all about palm trees, how they grow, flower, fruit and the uses people make of these marvelous plants...
A look at the diversity of Arizona's Coconino National Forest and some of the wildlife that makes its home there, in the northern part of the state, including the San Francisco Peaks near Flagstaff
Electrical fuse is a simple, less resistive, self sacrificial and cheapest device used to interrupt a circuit under short circuit, excessive overload or over current conditions.
Green, huge caterpillars in Arizona gardens have many enemies not the least of whom are the gardeners. If these hornworm caterpillars survive and pupate, they become moths with hummingbird skills.
Pleistocene rewilding aims to reclaim the natural world and restore it to how humans found it over 10,000 years ago. Is this a good idea?
Full instructions for Cupcake Baking Science Project which demonstrates the importance of different ingredients.
The rainbow eucalyptus is an unusual tree with a beautiful, multicoloured trunk. The trunk's colours change as the tree sheds strips of bark, creating living art.
(c) klanguedoc 2010. iOS SQLite Database is a tutorial that demonstrates how to create an iOS iPhone and iPad applications with a SQLite database.
Free physics problems help online with solutions on average velocity and average speed that walk you through each problem.
The marginal rate of technical substitution of Labor (L) for Capital (K) is the slope of an isoquant multiplied by -1. Since the slope of an isoquant is moving down, the isoquant is given by –ΔK/ΔL...
Mark Lynas's "Six Degrees" is a modern classic, outlining potential effects of various levels of global warming. It's summarized, evaluated, and updated here, with links to 7 supplementary Hubs.