What's black and white and can dive up to 1,800 feet under water? That's right, penguins! Learn this and many other amazing facts about these unique birds with this handy reference sheet.

A brief description to the patent filing and an excerpt from the patent request that Willis Johnson filed for his improvements in the egg beater. Included are drawings submitted with the patent request.

As part of the Smithsonian Art Museum's database of artists, Paul Cadmus is described here along with information on his contributions to art through his paitings (including his series "The Fleet's In") and his use of egg tempera.

The basics of how humans reproduce is covered here. Learn about female and male reproductive organs, mating, fertilization, how a fetus develops, and birth.

Describes what mimicry is. Describes the different kinds of mimicry found and by whom.