Say, Thomas (1787–1834), a United States naturalist. He wrote the first major American works on insects (American Entomology, 3 volumes, 1824–28) and shells (American Conchology, 2 volumes, 1830–34). Say was born in Philadelphia. He served as zoologist on the United States government expeditions, led by Stephen H. Long, to the Rocky Mountains (1819–20) and the source of the Minnesota River (1823). Say was curator of the American Philosophical Society, 1821–27, and professor of natural history at the University of Pennsylvania, 1822–28. He was a founding member of the Academy of Natural Sciences in Philadelphia.
Our planet would be a much different place without its richly diverse ecosystems full of plants, animals and microorganisms. What poses the biggest danger to the millions of species that call Earth home?
Winning first prize at the school science fair is one thing, but what if your project really made a difference? Could your project really change the world?