Biological fitness involves the number of offspring you produce and is not dependent on working out. The video explains natural selection using cartoon graphics of frogs on a log. Then it introduces evolution through antibiotic...

There are ten times more bacteria cells than human cells in the average person, and while many of them are helpful, there are some that can be deadly. This video explores the on-going battle between people and these microscopic...

Part two begins right where part one left off: discussing the potential for infections from microbes. Treatment of diseases is covered as well as the steps taken to prevent infection. New bacteria and viruses continue to develop, but not...

In this video segment adapted from A Science Odyssey, follow two scientists and their Nobel Prize-winning efforts to cure bacterial infections using penicillin. [4:54]

Scientists discuss a group of bacterial living in soil that can consume both natural and synthetic antibiotic compounds as their sole source of carbon-based food.

Explore how antibiotics help some sick people. Discover what happens when patients cut short their full course of antibiotic drugs.

A video investigating how bacteria affects other living organisms either positively or negatively. Teachers can visit Amoeba Sisters' website for a handout that goes along with video. [4:39]

Scientists discuss images of a bacterium that reveals a protective protein coat, and the potential applications of the research.

Photographs, a short QuickTime movie and accompanying text explain how penicillin kills bacteria. Try out the links to other sites about penicillin and antibiotic resistant bacteria.

The role of penicillin in the body. [0:33]

This video shows how penicillin in bread mold kills bacteria. [3:02]

A Naval officer coined the term 'antibiotic' in 1860, to describe his opposition to beliefs in alien life.

We're running out of antibiotics, and drug companies have little incentive to develop new ones. Can we save the ones we already have?