Take a look at an organized physics course. The 34-section electronic textbook covers material in AP® Physics 1 and 2. Teachers use the text to supplement lectures and have the class work through the labs. Each section contains...

Learn about the different types of microscopes, and how they can help scientific investigation.

A series of pages explaining how microscopes work, the parts of a microscopes, the techniques of using a microscope, and other useful information.

Microscopic images, detailed information, and illustrated diagrams help explain plant reproduction with a focus on fertilization.

Through full-color images and concise information, learn about the origin of cells. Discover some of the notable studies surrounding the history of life on Earth.