A new kind of city is being built in the Arab desert. Read about the unique engineering that is creating Masdar, a "city of the future" which doesn't use fossil fuels.

ZOOM cast members mix different amounts of baking soda and vinegar to see which combination produces the most carbon dioxide for launching a film-canister rocket. [3:23]

Explains the role of carbonic acid in the blood as part of a buffer system. Includes reactions.