Flip through Charles Darwin's digitized address book

Breakthroughs, discoveries, and DIY tips sent every weekday. If you've ever wondered whose addresses Charles Darwin was sure to keep tabs on--or even a few rat poison recipes--you're in luck. A digitized edition of the famed naturalist's personal address book is available online for the first time. "It's incredible that this little treasure-trove of details by Darwin has remained unpublished until now," NUS science historian John van Wyhe said in a statement . "It offers fascinating new insights into his life and the way he worked."