Learn how to convert Celsius scales to Fahrenheit (and visa versa). The site also provides some background information on the Fahrenheit, Celsius and Kelvin temperature scales.

Galileo was a very active scientist and mathematician, whose ideas often conflicted with those that were held during the 17th century. Read more about Galileo’s life, his work, and the problems he encountered.

Discover more about Anders Celsius and his work at the Uppsala Observatory in Sweden.

Find out more about Daniel Fahrenheit, the inventor of the alcohol thermometer and the Fahrenheit scale.

Visit the university where Lord Kelvin (inventor of the Kelvin temperature scale) worked, and read a short biography about the man who determined absolute zero.

Read more about the Mongolfier brothers' balloons?

Find detailed information on helium balloons and other less-dense-than-aircraft, go to the How Stuff Works web site.

Read about the race to circle the earth by balloon and find out more about the science and history of ballooning at Balloon Race Around the World

Find out about a modern high-tech balloon, the Breitling Orbiter, and the first manned circumnavigation of the earth by balloon.

Convection can move continents. Find out more about this process by visiting the United States Geological Survey’s Dynamic Earth or PBS’s Mountain Maker, Earth Shaker. Both these web sites provide an excellent introduction to plate tectonics.

If you want to find out more about what causes ocean currents, visit the Smithsonian Institution’s Ocean Planet web site.

Discover what causes land and sea breezes.

The Alyeska Pipeline Service Company’s site provides very detailed information on the Trans-Alaska Pipeline’s construction and operation.

For a lighter review of information about the pipeline, some interesting activities, and some of the issues surrounding its operation, try the Alaska Pipeline Think Quest site.