The human body contains more than 200 types of cells, and plants contain many other unique types of cells. While a huge variety of cells exist, they appear to have very similar structures. A detailed presentation describes the structure...

Knowing how to mix concrete is a big part of having a construction job. Here vocational learners will go through the types, economy, and uses for concrete. Each slide is rich in text but organized in an easy-to-read style. Images and...

This lesson will illustrate the different parts that make up a microscope, and explain how it works. It is 2 of 4 in the series titled "Parts of the Microscope."