Pre-K to Grade 2
When does mixing every color under the rainbow create pure white rather than a murky brown or black? When light, not paint, is the medium—and you're subtracting, not adding, color.
Are those sharp, pointy dinosaur teeth all the better to eat you with? Or are they designed for tough vegetation? Examine dinosaur teeth as a paleontologist would.
It's not what they ate or when they lived that distinguishes dinosaurs from other reptiles. It's the hole in their hip socket. Find out how this feature affected the way dinosaurs walk.
What kind of fossil is a tooth—body or trace? How about a nest of eggs? Or a skin impression? Examine the differences between body and trace fossils with these eight high-quality photographs.
Re-create the 130-million-year-old forest in what is now China to understand why this fossil site is of such vast scientific importance.
While refracting and reflecting telescopes use different means of collecting light, the same principle applies to both—the bigger the aperture, the more light collected.
When you think of your family's traditions and beliefs, what special objects come to mind? Would the meaning and value of these objects be clear to someone from another family or culture?
In outer space, you might not recognize the Big Dipper. The stars that form this constellation exist in 3-D not 2-D—so the star pattern changes with your viewpoint. Take another look at the Big Dipper.
We owe our lives to gravity. It holds the atmosphere to Earth and keeps us all from falling off into space. Not to mention that without gravity, the stars and planets—including Earth—wouldn't even exist!
"Atmosphere," "biofuels," "carbon dioxide"—challenge students to spell out their climate change knowledge from A to Z.