Abbe, Cleveland (1838-1916), a United States meteorologist, often called the "father of the Weather Bureau." As director of the Cincinnati Observatory, 1868-73, Abbe issued daily weather reports, which led to the federal government's establishment of a national weather service. He joined the newly organized Weather Service in 1871, serving as a meteorologist until 1916. Abbe was influential in securing the adoption of standard time zones. He was born in New York City and graduated from New York Free Academy (later City University of New York).
If humid air is just air plus water, then it has to be heavier than dry air, right? Sure, if it was only a matter of simple addition, but molecular physics is a lot like a bouncer at a club: Nothing gets in unless something else goes out.
We can usually see rainbows right after a rainstorm on a warm Spring day. These giant colorful arcs stand out against the dark rain clouds. Have you ever wondered what causes this phenomena? Find out how rainbows are created in this article from HowStuffWorks.