The first 30,000 pages of an online Encyclopedia of Life were unveiled today for public “alpha” testing and feedback. Intended as a tool for scientists and policymakers and a fascinating resource for anyone interested in living in the world, the Encyclopedia of Life (EOL) is being developed by a unique collaboration between scientists and the general public. By aggregating for analysis information on Earth’s estimated 1.8 million known species, the EOL will be a foundational resource for helping to conserve the species already known and to identify millions of additional species that haven’t yet been described or named. The EOL is supported through a $10 million grant from MacArthur, as well as $2.5 million from the Alfred P. Sloan Foundation.