AcademiaSTEMHumanitiesAgriculture & FarmingSocial Sciences
  • The black vulture and the turkey vulture are often called "Buzzards." These birds are anything but Buzzards. Buzzards are European birds related to Eagles. Vultures and condors differ from buzzards.

    The Black Vulture and the Turkey Vulture

    The Black Vulture and the Turkey Vulture

    by Wesman Todd Shaw34

  • Surface tension increases the tendency of the alveoli to collapse. Surfactant decreases the surface tension in the lungs and thus decrease the work of breathing, minimizes collapse and oedema.

    Surfactant  - Lowering Pulmonary Surface Tension

    Surfactant - Lowering Pulmonary Surface Tension

    by Chanaka Kahathuduwa0

  • A simple explanation of Albert Einstein's theory of special relativity and its effects on our understanding of space and time.

    What Is Special Relativity?

    What Is Special Relativity?

    by Sam Brind0

  • It may read like science fiction, but these fascinating examples of insect behavior come from the dedicated study by the late Thomas Eisner, the Father of Chemical Ecology.

    How Insects Use Chemicals to Survive

    How Insects Use Chemicals to Survive

    by Catherine Tally14

  • Living in America's Midwest, you may encounter these venomous snakes on your travels. Learn more about these creatures and what to do if you encounter them!

    The Many Venomous Snakes of the Midwest

    The Many Venomous Snakes of the Midwest

    by Matthew Hotaling2

  • Plants are a fundamental part of the existence of life. They utilize the energy of the sun in conjunction with inorganic compounds to manufacture carbohydrates and create biomass (Freeman, 2008). This biomass forms the basis of the food web as we...

    Plants, Photosynthesis, and the RbcL Gene

    Plants, Photosynthesis, and the RbcL Gene

    by InterestCaptured0

  • At first glance, the names of the muscles of the human body looks difficult to learn. These names are derived from Latin. Muscles names can actually be used as a short cut to learn a muscle's location, shape and it's function.

    The Latin Roots of Muscles Names

    The Latin Roots of Muscles Names

    by Edmund Custers0

  • Gamma Ray Spectroscopy - An introductory review of germanium gamma ray detectors, and the spectroscopic methods used in the measurement of x-ray escape peaks, annihilation photons, peak summing, energy resolution, and total and photopeak efficiency.

    Gamma Ray Spectroscopy

    Gamma Ray Spectroscopy

    by Thomas Swan2

  • The average zoo visitor may wonder what it is that tigers eat in zoos. It is the same as in the wild...meat. In the zoo however the fare varies as does the preparation and presentation.

    What Do Tigers Eat In Zoos?

    What Do Tigers Eat In Zoos?

    by Peter Dickinson35

  • You are walking down the road when, "eek!" you fall into a huge pool of quicksand. There is nobody near enough to hear your cries for help. How will you escape? Can you really drown in quicksand? How can your practice escaping from quicksand from the safety of your own home? This recipe for Cornstarch Quicksand is very similar to the real thing, it is easy to make, and it even lets you walk on water.

    Will Quicksand Kill You?  The Science Of Goo: Cornstarch, Quicksand, Oobleck, And Non-Newtonian Fluids

    Will Quicksand Kill You? The Science Of Goo: Cornstarch, Quicksand, Oobleck, And Non-Newtonian Fluids

    by Lena Welch1

  • Also known as the guigna, the kodkod is the smallest wildcat in South America and perhaps the world. Learn about this fascinating animal and how to tell it apart from its neighbor, the Geoffroy's cat.

    All About Wildcats: What Is a Kodkod?

    All About Wildcats: What Is a Kodkod?

    by M G Del Baglivo2

  • The Cape buffalo, also known as the "Black Death" or "widowmaker," kills about 200 people per year. However, two people have shown that it is possible to befriend this animal.

    Can You Make Friends With a Cape Buffalo?

    Can You Make Friends With a Cape Buffalo?

    by elnavann2

  • If you're like most people, you have no idea what goes on behind closed doors of your local hospital laboratory. Find out from a Medical Lab Technologist how the labs work and what lab techs do.

    What Does a Hospital Medical Lab Technologist Do?

    What Does a Hospital Medical Lab Technologist Do?

    by PurpleOne8

  • This is an example of a proposal for addressing a clinical issue. The topic is the use of wearable devices for reducing fall risks in geriatric patients.

    Wearable Devices to Reduce Fall Risks

    Wearable Devices to Reduce Fall Risks

    by Vince0

  • The precision and accuracy of two-pan balances reached maximum efficiency when the Scottich Chemist Joseph Black (1728-1799) introduced a 'knife edge' as the fulcrum to an already ancient design.

    A Look at Analytical Balances: A Matter of Balance

    A Look at Analytical Balances: A Matter of Balance

    by Jamie Lee Hamann10

  • 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.

    How to Identify Maryland Spiders

    How to Identify Maryland Spiders

    by Thomas Byers5

  • A black hole is a region of spacetime centred on a point mass called a singularity. A black hole is extremely massive and thus has an immense gravitational pull, which is in fact strong enough to prevent light escaping from it.

    What is a Black Hole? Do Black Holes Even Exist?

    What is a Black Hole? Do Black Holes Even Exist?

    by Nesbyte34

  • Hurricane season officially lasts until late November. Though the last six weeks are not overly abundant with these storms, deadly hurricanes can still occur in October, November, and even December.

    The 10 Most Deadly Late Season Hurricanes

    The 10 Most Deadly Late Season Hurricanes

    by Harry Nielsen0

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  • Marine compounds that were once known to be toxic to humans have now become life-saving drugs. Many of these are used either as anticancer drugs or to relieve pain in cancer.

    Anticancer Drugs From Marine Sources

    Anticancer Drugs From Marine Sources

    by Sherry Haynes0

  • A quadrant is a quarter of a circle. So to work out the area of a quadrant, first work out the area of the whole circle (use the formula A = π ×r²) and then divide the answer by 4. Alternatively, you could substitute the radius of the quadrant...

    How to Find the Area of a Quadrant (a Quarter of a Circle)

    How to Find the Area of a Quadrant (a Quarter of a Circle)

    by Mark1

  • So many space missions are never realized because of finances, politics, or technical limitations. Galileo somehow faced all of these and came through with some amazing science on Jupiter.

    Galileo's Fight and Flight to Jupiter

    Galileo's Fight and Flight to Jupiter

    by Leonard Kelley2

  • Earth has its own share of "unworldly" happenings that even science cannot explain. Some are similar to biblical phenomena that people will not believe easily. But these are real and they exist!..

    10 Incredible Natural Phenomena That Really Exist

    10 Incredible Natural Phenomena That Really Exist

    by Jennifer Gonzales2

  • This article looks at ten sandy beaches of extraordinary colour, what they are composed of and how they are formed, with illustrations of all ten

    10 Beaches of Unusual Colour

    10 Beaches of Unusual Colour

    by Greensleeves Hubs16

  • From their host-finding antics to their survival skills, ticks are amazing creatures. In some ways, they're practically superheroes of the insect world (evil superheroes, that is) with a thirst for adventure and some, well ... pretty incredible super-tick powers.

    Five Freaky Facts About Ticks

    Five Freaky Facts About Ticks

    by Jill Spencer19

  • Galileo, the great prototype for all scientists, made many discoveries in physics and astronomy. But whose work did he build off of?

    Physics Before Galileo

    Physics Before Galileo

    by Leonard Kelley0

  • 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.

    10 Milestones of Space Exploration

    10 Milestones of Space Exploration

    by Marco1

  • Trig graphs are easy once you get the hang of them. Once you learn the basic shapes, you shouldn't have much difficulty. The main problems A-Level students have, in my experience, are: Remembering which is y = sin x and which is y = cos x....

    Trigonometry—Graphing the Sine, Cosine and Tangent Functions

    Trigonometry—Graphing the Sine, Cosine and Tangent Functions

    by Mr Homer7

  • 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.

    Types of Microscopy

    Types of Microscopy

    by Rhys Baker0

  • Due to the threats encountered by mountain gorillas, it was once thought that they might be extinct by the end of the 20th century. Conservation efforts are helping the species to recover.

    Saving the Mountain Gorilla

    Saving the Mountain Gorilla

    by Natalie Cookson0

  • Volcanic eruptions are a stunning sight. But how do they happen? Learn more about the science of volcanoes and volcanic eruptions in this article.

    What Causes a Volcano to Erupt?

    What Causes a Volcano to Erupt?

    by Rickrideshorses49

  • A summary of the key topics in nuclear reactor physics and a look at the worst nuclear accidents (Chernobyl and Fukushima).

    Nuclear Reactor Physics

    Nuclear Reactor Physics

    by Sam Brind0

  • Already a complicated subject, black holes get even weirder when viewed through the lens of string theory. Read on for some odd possibilities for what black holes really are.

    What Are Black Holes in String Theory?

    What Are Black Holes in String Theory?

    by Leonard Kelley0

  • Lions declared endangered in 2015. Read about African conservationist Kevin Richardson and who the main culprits are for the demise of the endangered African lion population.

    Are Lions Endangered and Who Is Caring for Them?

    Are Lions Endangered and Who Is Caring for Them?

    by Lisa McKnight15

  • Blue Jays are not only clever mimics, but highly intelligent birds that love day old bread. They have the reputation for being bully birds, and rightly so. But I don't think there's a prettier sight in the middle of winter than blue jays and cardinals in the snow!

    Blue Jays—Clever Mimics of the Bird World

    Blue Jays—Clever Mimics of the Bird World

    by Connie Smith26

  • Chemistry can be a very difficult subject to grasp, but is essential for understanding how the world around us truly works. To truly understand Chemistry, one must start with the basics.

    Chemistry in a Nutshell

    Chemistry in a Nutshell

    by Jacob Rittenour0

  • Once you've managed to overcome your fear of spiders, they turn out to be fascinating creatures. Here's 8 unusual facts about these arachnids.

    8 Unusual Facts About Spiders

    8 Unusual Facts About Spiders

    by aa lite45

  • There's a lot to know about chipmunks—the cute little animals that people love to watch and photograph, but hate when they start digging up a garden or burrowing holes near a house's foundation.

    Chipmunks: Chubby-Cheeked Hoarders That Can Become Pests

    Chipmunks: Chubby-Cheeked Hoarders That Can Become Pests

    by Mike and Dorothy McKenney5

  • Decades ago, in 1982, the World Meteorological Organization chose the name Sandy in their alphabetical list of named Atlantic storms, never knowing that this would become a storm of immense proportions that would affect much of the eastern seaboard,...

    In the Path of Super Storm Sandy

    In the Path of Super Storm Sandy

    by toknowinfo33

  • A summary of the major organelles and functions of the animal cell. A simple explanation of how to draw an animal cell.

    How to Draw a Cell from an Animal

    How to Draw a Cell from an Animal

    by Patrice M10

  • The Eastern Wolf is especially rare, found only in and around Algonquin Provincial Park in Ontario. This article includes facts, photos, and chilling video of an Algonquin Park public wolf howl.

    The Eastern Wolves of Algonquin Park

    The Eastern Wolves of Algonquin Park

    by JessBraz7

  • The Earth has an exceptionally large moon compared to the size of other planets' moons. Start exploring the celestial sphere by observing our beautiful natural satellite.

    Astronomy for Beginners: Observing the Moon

    Astronomy for Beginners: Observing the Moon

    by Marco0

  • 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.

    10 Rare Fossils of Species That Lived With Dinosaurs

    10 Rare Fossils of Species That Lived With Dinosaurs

    by Jana Louise Smit0

  • The special theory of relativity is a theory by Albert Einstein, which can be based on the two postulates Postulate 1: The laws of physics are the same (invariant) for all inertial (non-accelerating) observers.* Postulate 2: In a vacuum the speed...

    Minkowski Diagram

    Minkowski Diagram

    by lgsims963

  • These distances are measured in degrees and radians. The angular diameters of these objects are normally very small; therefore, it is better to represent them in degrees, arcminutes and arcseconds.

    How to Measure the Angular Size of the Big Dipper

    How to Measure the Angular Size of the Big Dipper

    by Jose Juan Gutierrez0

  • 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.

    The Jerusalem Cricket:  It's Really Just a Potato Bug

    The Jerusalem Cricket: It's Really Just a Potato Bug

    by Mike and Dorothy McKenney3

  • Glaciers are increasingly in the news because they are an important factor to consider in global warming. It's important to know the basics!

    Glacier Facts: Why Glaciers Matter

    Glacier Facts: Why Glaciers Matter

    by Tessa Schlesinger2

  • Have you ever thought about how nice it would be to travel back in time to repair bad choices? Perhaps you've dreamed of seeing someone from your past? According to scientists time travel is possible.

    Time Travel Is a Possibility

    Time Travel Is a Possibility

    by Betty A F7

  • Sedimentary rocks are fantastic formations that each and everyone tells an amazing history! If we know what to look for, we can read about the fascinating journey the particles in the rocks have done....

    Sedimentary Rocks Formation and Fossils!

    Sedimentary Rocks Formation and Fossils!

    by Christina Lornemark87

  • Japanese volcanoes are as beautiful as they are deadly. Here are 7 famous Japanese volcanoes that have inspired fear and love throughout the centuries.

    7 Japanese Volcanoes to Love and Fear

    7 Japanese Volcanoes to Love and Fear

    by Kuan Leong Yong0

  • Dark matter is one of the current mysteries in physics. We don't know what it actually is so how do we know it's there?

    Is There Proof of Dark Matter?

    Is There Proof of Dark Matter?

    by Sam Brind2

  • There are now many invasive insect species in Britain, and they can have a big impact on the environment. So let's have a look at what damage they cause and how they are affecting native species

    Problems Caused by Invasive Insect Species in the UK

    Problems Caused by Invasive Insect Species in the UK

    by AnimalWrites12

  • Introduction The science of remote sensing has emerged as one of the most fascinating subjects over the past three decades. Earth observation from space through various remote sensing instruments has provided a vantage means of monitoring land...

    Introduction and Scope of Remote Sensing

    Introduction and Scope of Remote Sensing

    by Rashel Nirjhon27

  • Need help with trig homework or a review of the basics? This article explains in plain English how to visualize the unit circle as just a set of triangles, how a sine and cosine work, and radians.

    Trigonometry: The Unit Circle [in Plain English]

    Trigonometry: The Unit Circle [in Plain English]

    by JB1

  • Discover a side of Minnesota you might not know about: flowers! 11 flower images and information on what they are and where they grow, including a short video. Take a poll at the end to vote for your favorite.

    Minnesota Wildflowers (Image Gallery)

    Minnesota Wildflowers (Image Gallery)

    by Faceless3935

  • Whether for professional or academic purposes, choosing a model organism for experimentation can be a tough call. Here are some points about why zebrafish might be the animal you're looking for

    The Why and How of Breeding Zebrafish for Research

    The Why and How of Breeding Zebrafish for Research

    by Sara Ramcharran0

  • Why is the sky at night dark if stars are everywhere? Read on to find out the surprising answer!

    What Is Obler's Paradox?

    What Is Obler's Paradox?

    by Leonard Kelley3

  • The nth term of a number sequence is a formula that gives you the values in the numbers sequence from the position number (some people call it the position to term rule). Example 1 Find the nth term of this sequence. 5 8 11 14 17 First of...

    How to Find the nth Term of an Increasing Linear Sequence.

    How to Find the nth Term of an Increasing Linear Sequence.

    by Mark14

  • The animals of the sea are playful and beautiful in their own special way. Learn about these remarkable aquatic animals - some of the largest in the world - manatees and dugongs.

    Dugongs Mermaids and Manatees

    Dugongs Mermaids and Manatees

    by Kelly Kline Burnett8

  • A poor defenseless gummy bear, a test tube full of liquid potassium chlorate, and a couple of slightly mad scientists; seems like the perfect set up for some absurd B-movie horror flick, does it not? Well, not quite. It is more along the lines of...

    Gummy Bear meets Potassium Chlorate Experiment

    Gummy Bear meets Potassium Chlorate Experiment

    by Anna Marie4

  • In addition to serving the function of respiration, the respiratory system is involved in providing immunity, in olfaction, in phonation, as a reservoir and a filter for CVS and as a metabolic ground

    Non-Respiratory Functions of the Respiratory System

    Non-Respiratory Functions of the Respiratory System

    by Chanaka Kahathuduwa1

  • Don't let mind readers and magicians mess with your mind with number tricks. Learn their secrets and beat them at their own game.

    It's Not Magic, It's Mathematics

    It's Not Magic, It's Mathematics

    by George Dimitriadis1

  • The bird family Alcidae evokes images of cold, windswept, ocean escarpments or upwellings miles out to sea. The Pigeon Guillemot, however, is the "Easy" Alcid of tourist traps and public beaches.

    Pigeon Guillemot - The "Easy" Alcid

    Pigeon Guillemot - The "Easy" Alcid

    by Mel Carriere16

  • There is a lot going on in the night sky. Take a look with a discerning eye and be amazed at the celestial entertainment above.

    Stars in the Winter Night Sky

    Stars in the Winter Night Sky

    by Tom Lohr2

  • For more than six decades in the Middle Ages a mysterious disease swept through England killing thousands.

    England’s Sweating Sickness

    England’s Sweating Sickness

    by Rupert Taylor6

  • 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.

    Weird and Wacky Inventions

    Weird and Wacky Inventions

    by Rupert Taylor3

  • Here is a lab report example with step-by-step instructions on writing a good lab report. When writing a lab report you are presenting scientific facts that support a hypothesis, to an audience.

    How to Write a Lab Report

    How to Write a Lab Report

    by Laura Writes0

  • The State of New York has a beautiful array of mushrooms and other fungi growing among the oak, maple, and beech forests. This photo gallery of orange and yellow mushrooms was taken in Frewsburg, a town in the "Southern Tier" of Western New York. Many of these mushrooms can be found in the wider Great Lakes geographical area.

    Pictures of Mushrooms in Western New York

    Pictures of Mushrooms in Western New York

    by Leah Lefler23

  • What snakes live in Indiana? Are any of them venomous and/or dangerous? There are nearly 40 different species and subspecies of snakes that can be found in the Hoosier state. Although three out of the four front-fanged venomous snakes are endangered (Timber Rattlesnake, Cottonmouth, Eastern Massasauga Rattlesnake) and hard to find, the Copperhead is not. Although many Hoosier snakes are rear-fanged venomous, their venoms don't pose a significant threat to people.

    Snakes in Indiana

    Snakes in Indiana

    by ChristopherJRex3

  • While in flight, at the nectar feeder, fending off intruders, or enjoying a rain shower on a hot summer day, Ruby-Throated Hummingbirds constantly communicate and vocalize. Read about these ‘songs’ and you will begin to hear your hummers with different ears.

    The Sounds of Hummingbirds

    The Sounds of Hummingbirds

    by Connie Smith14

  • This is the third page in a series of guides for anyone who wants to learn a little more about our night sky. This page looks at those most numerous of all objects visible in the night sky - the stars

    Astronomy—A Beginner's Guide to the Stars

    Astronomy—A Beginner's Guide to the Stars

    by Greensleeves Hubs10

  • Formosan termites may not worry about moth holes in their sweaters, but they are the first insects discovered to fumigate their nests with naphthalene. Scientists have discovered that termites, like the Formosan Subterranean Termite (Coptotermes formosanus), produce naphthalene - a hydrocarbon - which they apparently use as a defense against natural enemies, such as ants. People use the compound to rid human nests of carpet beetles and clothes moths, and to repel intruders such as bats and star

    Termites and Naphthalene (Mothballs)

    Termites and Naphthalene (Mothballs)

    by drdollars0

  • A starfish ripped into pieces can grow a new starfish from each piece. What more could you possibly want to find the perfect science nonfiction monster living among us? Find out here.

    Starfish: What Is it That Makes Them so Creepy?

    Starfish: What Is it That Makes Them so Creepy?

    by Theophanes3

  • Did you know that the peacock actually refers only to the male of the species known as the peafowl. Additionally, the peacock's train is used to attract mates and makes up more than 50% of the peacock's size. Learn more great facts about the peacock in this article.

    The Proud Peackcock: Eight Fun Facts on the Indian Peacock

    The Proud Peackcock: Eight Fun Facts on the Indian Peacock

    by hannahz9

  • Bulk flow of air in between the environment and the lungs is an important respiratory function. Coordinated, active movements of the thorax and the diaphragm, result in inspiration and expiration.

    Pulmonary Mechanics

    Pulmonary Mechanics

    by Chanaka Kahathuduwa0

  • It might be easy to overlook Dark-Eyed Juncos because of their gray and brown colorations. But it is impossible to overlook their helpful and voracious weed seed and insect-eating appetite. Come discover more about the number one feeder bird in the US!

    The Juncos I Have Come to Know

    The Juncos I Have Come to Know

    by Connie Smith22

  • Cape Buffalo are known as Black Death and feared and sought after by hunters. Can you tame a Buffalo? Read about my own encounter and learn more about these majectic beasts.

    Cape Buffalo—Facts and My Personal Encounter

    Cape Buffalo—Facts and My Personal Encounter

    by elnavann0

  • The debate is hardly over yet, but the scales-versus-feathers controversy just gets more and more interesting. Which dinosaurs certainly had feathers, and which dinosaurs might have?

    Did Dinosaurs Have Feathers or Scales?

    Did Dinosaurs Have Feathers or Scales?

    by Will Apse5

  • How to learn your times tables fast. There are a few tricks to help you with your times tables and even a link to my video "How to Learn Your Times Tables Fast"

    How to Learn Times Tables

    How to Learn Times Tables

    by SuffolkJason30

  • The history of life series moves on to the period where not only complex lifeforms evolved, but came to take over the world. But they didn't have everything their own way, the Paleozoic era bore witness to natural disasters that make our problems seem minute...

    A History Of Life On Earth: The Palaeozoic Era

    A History Of Life On Earth: The Palaeozoic Era

    by James Kenny29

  • Though a thorough list of movies would go on forever, it is possible to look at the Hollywood approach to black holes and learn what they got right—and absolutely wrong.

    How Accurate Are Black Holes in Film?

    How Accurate Are Black Holes in Film?

    by Leonard Kelley0

  • Honey bees are an amazing insect that is gaining support because of their importance in agriculture and producing food. Here are five interesting facts that most people don't know.

    5 Little-Known Bee Facts

    5 Little-Known Bee Facts

    by Chris Andrews9

  • Is the tomato a fruit or vegetable? It depends on your school of thought. Explore the topic botanically, horticulturally and from a homeowners perspective.

    Is a Tomato a Fruit or a Vegetable?

    Is a Tomato a Fruit or a Vegetable?

    by Brandon Lobo52

  • Tadpoles are very different from adult frogs and, after a period of growth, undergo metamorphosis. To change into the adult form, they must develop limbs, lose their tail and gills and remodel their guts and head to change into an amphibian that can live on land.

    Tadpoles—the Larvae of Frogs and Toads

    Tadpoles—the Larvae of Frogs and Toads

    by aa lite9

  • A photographic odyssey explaining the progression and formation of the ice shelves forming on The Great Lakes before and after the 2014 historic polar vortex event. Includes hidden dangers!

    Solid Shoreline and Polar Vortex Events

    Solid Shoreline and Polar Vortex Events

    by Kathi31

  • We've been watching the dramatic New Horizons flyby of Pluto over the past few weeks, and many people are saying, "Come on, REALLY. That's a PLANET!"

    So, Really, Isn't Pluto A Planet?

    So, Really, Isn't Pluto A Planet?

    by Ellen5

  • Have you ever wondered why some birds have iridescent patches; or why Northern Cardinals are red; or what makes Blue Jays blue? How dull would life be without the colors that punctuate our lives? Everywhere you look Mother Nature has given us a huge paint box full of colors; and she reserves her most diverse color palette for our backyard birds.

    How Do Birds Get Their Colors?

    How Do Birds Get Their Colors?

    by Connie Smith15

  • Volcanoes come in many forms, from the steady and slow-moving basalt flows of Hawaii, to towering mountains such as Mount Fuji, to the calderas of super-volcanoes. Below are a couple that are overdue.

    Mountains of Fire & Ice: Doomsday Volcanoes

    Mountains of Fire & Ice: Doomsday Volcanoes

    by Lloyd Busch1

  • Roman numerals have been around for about 3,000 years, and they became a recognized number system that was used around the world.

    How To Understand Roman Numerals

    How To Understand Roman Numerals

    by sobelarry1

  • Nobody knows exactly where this probe is nowadays. NASA lost contact with it in 2003, ending a 30-year mission. But there's a milestone here, it's now the furthest derelict man-made object.

    Where Is Pioneer 10 Now?

    Where Is Pioneer 10 Now?

    by Jason Ponic1

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