Can you tell the difference between a leech's jaw and its back sucker? Test your knowledge of these blood-thirsty worms.
For billions of years the greenhouse effect has made life possible on Earth. Build a terrarium—your own miniature greenhouse—to see this process at work.
Can you tell the difference between an Emmy award and an Olympic medal? Test your knowledge of gold-plated objects. Then find out more about gold!
Follow mermaids around the world and throughout history to see first-hand how cultures share and reinterpret mythic creatures.
Setting sail without a map wasn't the only concern facing European explorers. Their heads had also been filled with tales of monsters lurking in the oceans' depths.
The elusive giant squid was first described 500 years ago by Scandinavian sailors. Investigate what we've learned--and what still remains unknown--about this mysterious deep-ocean creature.
Explore your ancestral past and the 22nd-century possibilities of DNA research with this collection of kid-friendly titles selected for the Hall of Human Origins.
What are evolutionary trees? How do hominids differ from primates? And why is it important that humans are capable of symbolic thought? Find out with this guide from "DNA" to "variation."
Can you tell the difference between a giraffe's bones and those from a mammoth? Test your knowledge of fossils.
How do your fossil-sorting skills stack up? Put them to the test with this kid-friendly online puzzle.