Students will work in groups to grow crystals in different conditions, and then make conclusions about how and why crystals form. A detailed procedure and materials list, follow-up questions, and a teacher's guide that contains extension...

Read about the accomplishments of Marcello Malpighi, a seventeenth century Italian physiologist. Includes a black and white portrait.

In this short video, you will see the rippling and pulsing of a snail along with a view of the circulatory system. This site also provides background information on the aquatic snail.

In this succinct video, the aquatic snail uses the sliding action of its pseudopod to move about. Background information on the aquatic snail is also provided in this site.

Select from one of two movies which depict a rotifer feeding while traveling slowly in pond environment. Background information is provided on rotifers in this interesting site.

Under the title, "Thin Lens and The Thin-Lens Equation," this site provides an animation of an object responding to the changes of its distance to the lens.

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Illustration of a magnifying glass.

Labeled diagram showing the main components of a wave.