Describes mosquitos and the problems humans have with them.

Informs about tuberculosis using animation.

Discusses the work of Dr. Daniel Hale Williams.

Explains what drew John Muir to the wilderness and made him one of the most influential environmentalists.

Discusses The President, most likely the world’s largest tree, as it is photographed by National Geographic.

Discusses the “father” of modern observational astronomy.

Demonstrates a simple homemade thermometer.

Explains Fahrenheit and his discoveries.

Discusses Albert Einstein’s realization and development of the theory of general relativity.

Includes instructions and a demonstration of how to build a simple light bulb.