Know It All: Microscope | Hobby Shop

We know that the type of soil varies by location, but does the seafloor sediment also vary, or is it all the same? Scholars compare photos of the seafloor from two different locations: the Savannah Scarp and the Charleston Bump. Through...

What better way to learn how to use a microscope than building your own? A lab investigation has scholars use lenses from magnifying glasses and sheets of cork to design their own compound microscopes. They calculate focal length...

Is it possible all current lineage trace back to one male and female? Mitochondria DNA suggest just that! A lesson with this interesting perspective on genetic heredity explains how all human DNA connects to a single male and female in...

The ancestors of squid and octopus used shells as a form of defense. Pupils learn how cephalopods evolved without shells and the adaptations required to survive without one. Viewers learn how scientists know about these changes and the...

Design your own virtual rocket, and then test launch it. Watch tutorials about Newton's laws of motion and rocket basics to help you improve your rocket's performance.

Robert Krulwich, host of NPR's climate connections videos, is a master of explaining carbon and its role in nature, especially in global warming. His discussions in the five videos, that range from three to four minutes, are interesting,...

Teach the class how to use a microscope to identify bacteria in food. Scholars explore the different parts of the microscope and learn how to determine total magnification. They walk step-by-step through the procedure of preparing slides...

Find award-winning science, math and technology videos and interactives for grades K-12 produced by NASA and provided for distribution to South Carolina ETV's Knowitall.

An interactive timeline of notable inventions and inventors from the 19th century to the present.

An upward force called lift acts on the airplane and opposes the downward forces of gravity. The lift force allows the airplane to get off the ground and stay in the air. Watch the simulation to see how this works.