Jussieu, Antoine-Laurent de (1748–1836), a French botanist. One of a family of five distinguished botanists, Jussieu studied under his uncle, Bernard de Jussieu (1699–1777), whose work he incorporated into Genera Plantarum (1788–89), a treatise on plant classification. It divided plants into three primary divisions—the acotyledons (plants lacking seed leaves), the monocotyledons (plants with one seed leaf), and the dicotyledons (plants with two seed leaves). Plants were further grouped into 100 families, many of which are still recognized today. Jussieu was professor at the Museum of Natural History, Paris, 1793–1826, and organized its botanical collections.
One was a celebrated author, the other a famed physicist. What the two shared was a public exposure of their religious beliefs. Big E had an on-again, off-again relationship with God, while C.S. was an avowed atheist during his early years.
He is famous for a phrase he never said, for wearing turtlenecks and for hosting the original 'Cosmos' TV series. As enthusiastic about the stars as he was about marijuana, Carl Sagan led a very surprising life. Here are 10 cool facts.