Test your classification skills with this leafy challenge. Examine drawings of 12 oak leaves, and see if you can determine the common and scientific name for each one of the dozen.
The world's climate is changing. Scientists say the effects of these changes could be devastating to living things on Earth—including humans. See what scientists are doing now, and learn ways to help.
"Greenhouse effect" and "global warming" are becoming household phrases but how, exactly, are they linked? Explore the interconnections and consequences of climate change.
What can you tell from looking at a fossil record of dinosaur footprints? Everything from which dinosaur was there first to what they might have feasted on.
Try to imagine a world without horses. For starters, what would Paul Revere have used to make his midnight ride on, a cow?
Not all dinosaurs were enormous like the 84-foot-long, 30-ton Apatosaurus. TheCompsognathus, for example, approximated an eight-pound chicken. Size up two others.
The most common fossils are bones and teeth, but not all fossils are body parts. Explore the wide-ranging evidence of ancient life that scientists use to understand Earth's prehistoric past.
How many times would your footprint fit into that of a large dinosaur? Could all of your classmate's feet fill up the small crater? Find out with this personalized look at the 35-ton Apatosaur.
Dinosaurs all belong to the same group, but within that group there are many subsets—meat-eating dinosaurs, four-legged dinosaurs, and so on. Try your hand at classification with these eight dinosaur illustrations.
Did you know that squamates have a third eye? Or that the Gila Monster and the Bearded Lizard are the only two known venomous lizards? Discover more interesting facts about squamates.