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OLogy is now available offline! You can download the OLogy App today.
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This famous long-necked, long-tailed wonder belongs to a group called "sauropods." 
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Compared to other titanosaurs, Gondwanatitan was a peewee at only about 7.5 meters (25 feet) long. 
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As you can tell from its body plates and tail spikes, this dinosaur is related to Stegosaurus. 
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This horned dinosaur had two long spikes on the back of its frill, the bony extension behind its skull.
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This plant-eating dinosaur was an ornithopod, as are duck-bill dinosaurs. 
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A dinosaur book led to this paleontologist's lifelong fascination with fossils.
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Mongolia is a large country in the middle of Asia. Its Gobi Desert is a fossil "gold mine" for paleont...
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Fossils are the key to understanding life in the past.
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Many famous dinosaurs, such as T. rex and Triceratops, first appeared in the Cretaceous Period.
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These rocks provide the most clues about the history of life on Earth. 
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With its bird-like features, this animal was mistaken for a giant bird for a while.
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Would you measure the distance between New York and New Delhi in inches? For the same reason, astronomers don't use m...
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The Orion constellation is known for having some of the brightest stars in the night sky. On a clear night, try to fi...
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All dogs, from the giant Great Dane to the tiny Chihuahua, belong to the same species: Canis familiaris. Within that...
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This extinct bird weighed over 330 pounds and had heavy legs and tiny wings. 
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His love of natural sciences and extreme camping led this scientist to paleontology.
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Carefully removing the fossils without damaging them takes talent, special tools, and lots of patience. 
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This real-life "Indiana Jones" led the first AMNH expeditions to the Gobi Desert in Mongolia.
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Every summer, Museum paleontologists join Mongolian scientists to hunt for fossils. 
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Located in the Gobi Desert, this is a fossil "hot spot" for Museum paleontologists. 
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To try to piece together how organisms are related, scientists use cladistics.
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An animal or plant becomes extinct when the last of its kind dies. 
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About 80 million years ago, during the Late Cretaceous, this armored plant-eater roamed the Gobi Desert in Central Asia.
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Ninety-three million miles from Earth, a giant ball of hot gas brightens the sky. Nuclear reactions in the Sun's core...
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If you ever go to Mercury, bring your sunscreen because it is the planet closest to the Sun. You'll also need a pair...
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Venus and Earth are sometimes called sister planets because of their similar size, but don't let this comparison fool...
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The Earth is our home. So far, it's the only place that we know of that has life. Everywhere you look on Earth there...
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Its brow horns and snout horn inspired this dinosaur's name, which means "three-horned face."
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This living dinosaur is also known by its common name, the Martineta tinamou. 
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This prehistoric relative of living ducks had a long neck, tall legs, webbed feet, and a duck-like head.
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Because of the diamond-shaped plates on its back, Stegosaurus was given a name that means "roof lizard." 
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Mars is often called the "red planet." It's red because its surface is covered with rusted particles of iron.
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Scientists have identified over 1.75 million species on Earth -- over one million of them are insects and spiders.
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The oddest thing about Uranus is that the planet, its rings, and its moons "roll" around the Sun on an axis...
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The smallest and most distant of the "gas giant" planets. Neptune has much in common with its three huge ne...
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Pluto was discovered in 1930 and considered to be the ninth planet in our solar system.
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Comets are like "dirty snowballs" that have orbited the Sun since our Solar System formed, billions of year...
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Asteroids are space rocks that have existed since the formation of the planets over 4.6 billion years ago. Scientists...
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Did you ever see a "shooting star"? What you really saw was a meteor burning up in the Earth's atmosphere.
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The Hubble Space Telescope is the first major optical telescope to orbit Earth.
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Before telescopes were invented, people gazed at the night sky with amazement and dreamed of a closer look.
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On July 5, 1997, the six-wheeled robotic rover, Sojourner, rolled down a ramp from the Pathfinder spacecraft onto the...
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Edwin Hubble was one of the great astronomers of the 20th century. His work made the Universe a bigger place. He prov...
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On a clear night, Mike Shara sees more than just the beautiful twinkling of stars when he gazes at the sky.
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The National Aeronautics and Space Administration (NASA) runs the space program, but that's just part of what they do.
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Scientists believe that everything in the Universe began about 13 billion years ago in a giant explosion called the B...
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About 1,000 years ago, a massive star exploded at the end of its life cycle. What remains is the Crab Nebula, a glowi...
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A solar system is made up of a star and everything that travels around it. Solar means "of the sun.
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The Milky Way is the galaxy in which our Solar System lives. There are more than 200 billion stars in our spiral gala...
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You have to be a really big thinker to imagine the size of the Universe.
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A galaxy is a giant, spinning object made of gas, dust, and stars held together by gravity. Galaxies come in differen...
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Genetics is the study of how traits are passed from one generation to another. Traits such as eye color and nose shap...
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Saying "deoxyribonucleic acid" is a real mouthful. Luckily, you can call it DNA for short.
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Have you ever wondered why you look like your parents, grandparents, or siblings? It's because of your genes -- the i...
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Thousands of plants and animal species may be in danger of becoming extinct and disappearing forever.
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The Sumatran tiger is found in only one place on the Earth -- on the island of Sumatra in Indonesia. Fewer than 500 o...
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Growing up, Joel Cracraft loved reading travel and adventure books. In high school, he became interested in ornitholo...
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Chromosomes are tiny, spaghetti-like packages of information. Every cell of your body contains 23 pairs of them -- th...
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Since he was a kid, George Amato has been wild about wildlife. Today he works for the Wildlife Conservation Society a...
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In 1997, Dolly rocked the world of genetics. Not baaaa'd for a little lamb from Scotland. What was the big deal? She...
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The nucleus is like the remote control center of the cell. It acts as the cell's brain by telling it what to do, how...
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DNA is shaped like a long twisted ladder, and pairs of bases form the ladder's steps. Bases are known by the letters...
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An invasive species is a living thing that moves into a new region. Species often become "invasive" as a re...
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When Paula Mikkelsen moved to Florida, she turned a fun hobby into an exciting career. She enjoyed walking along Flor...
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Considered a pioneer in astronomy, Johannes Kepler is best known for his three laws of planetary motion.
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Look at all the things around you -- your computer, your finger, your desk, even the trees outside. They're all made...
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When we think of "space," we often think of "outer space" -- the vast, empty, dark space that sur...
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Einstein might never have become a worldwide celebrity had it not been for the English astrophysicist Arthur Eddington.
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Mass and weight may seem like the same thing, but in fact these two measurements are very different. Mass is the tota...
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Albert Einstein was a Nobel Prize-winning physicist who changed the way we think about our world and our Universe.
Game

Take an expedition across the Martian landscape with this video, then test your knowledge!
Hands-on

Find out which of your traits are due to nature OR both nature and nurture. 
Video

What's threatening planet Earth and how can we protect it? Find out more in these videos of kids at the Museum.
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Do you know how climate works? Here are some questions to test your climate knowledge.
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Our oceans are full of colorful creatures. Find out how animals use color for attraction, communication, and camouflage. 
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We see with our eyes, but our brains do most of the work. Watch what happens when light bounces off an object and enters your eye. 
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Herpetologist Chris Raxworthy answers kids' questions.
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Explore an ancient city carved into the sandstone cliffs.
Game

What happens when you mix colors of light? The results might surprise you!
Game

A “billion” is a very large number. Exactly how much is a billion? And how do you write big numbers like a billion?
Story

The largest mammal at the Museum is interviewed by the largest dinosaur
Game

Can you match these marine animals with their baby pictures? 
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Solve genetic riddles as you wind your way through the star-studded park.
Hands-on

Send a note to a friend with these horsey letterheads.
Story

Check out the scrapbook to learn about this amazing race!
Story

Find out about Taiwan's fascinating fluttering insects.
Hands-on

Send a note to a friend with these ancient letterheads.
Hands-on

Send a note to a friend with these astronomical letterheads.
Hands-on

Send a note to a friend with these colorful letterheads.
Hands-on

Send a note to a friend with these colorful letterheads.
Hands-on

Send a note to a friend with these watery letterheads.
Hands-on

Send a note to a friend with these colorful letterheads.
Story

Take a peek inside two paleontologists' scrapbook.
Story

Find out why a ball thrown in the air will return to the ground. 
Story + Game

Find out how the Big Bang Theory came to be.
Story

Take a peek into a mineralogist's scrapbook to see why he thinks jade is so special.
Hands-on

Follow these easy steps to create a floor plan of your room.
Hands-on

Decorate, shatter, and piece together your own pottery artifact!
Story

Explore this family tree of living things on Earth.
Story

Two thousand years ago, an ancient city called Petra thrived deep in the desert of Nabataean kingdom.
Story

Water is a precious resource, and all things need water to survive.
Story + Video

Astronomy is a BIG subject. We've brought learning about it down to size with these big ideas.
Story

How is the ocean like a layer cake? What creatures live there? And how important is the ocean? Take a dive and find out!
Story

In this comic book series, follow an entomologist into the world of parasitic wasps. 
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Find out what lives in the deep sea, coral reef, and continental shelf.
Hands-on

Send a note to a friend with these colorful letterheads.
Hands-on

Create weather tools to gather wind, rain, and pressure data in your neighborhood.