Afterwards, National Geographic and NOVA/WGBH for a premiere screening of Darwin’s Greatest Challenge at 7 PM, as we celebrate the 200th anniversary of Darwin’s birth and the 150th anniversary of his seminal work, On the Origin of the Species. The drama unfolds over the course of roughly 2 weeks in June and early July of 1858. During this time, Darwin’s world seems to disintegrate: his life’s work, what he called “his abominable volume,” is in danger of being scooped by an unknown; at the same time, one of his children his stricken by scarlet fever and one with diphtheria. Darwin is reeling, with his career and home in tumult. Never before has a more personal nor more accurate account of Darwin’s life at this critical juncture been explored.