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"This particular algal species, commonly found in polluted water, is often referred to as "pond scum". As the movie switches to a 20x lens and then the 40x, watch closely, toward the center of each cell in the strand, for the cell nucleus. It's right near the middle and shows as a round object that is near transparent, but once you see it, you will see others. "

"As the most visible man-made object in the night sky the International Space Station (ISS) is of significance to humankind. It takes humans from being explorers of space to being residents of space. "

"In this video, I show how to find the speed of a moving object, using distance and time. I've included one example to show how it works. Thanks. "

MaKey MaKey is an invention kit for the 21st century. Turn everyday objects into touchpads and combine them with the internet. It's a simple Invention Kit for Beginners and Experts doing art, engineering, and everything inbetween:

A great flash game where players must shoot a ball into a hole and use the magnets to help you. There is lots of science to learn in this game including about magnets, gravity and the orbits of space objects. http://ictmagic.wikispaces.com/Science

"A great chemistry app for PC, Mac and iPad which lets you explore the molecular composition of everyday objects."