October 13th is National Fossil Day! In commemoration, Wired Science has a gallery of recent discoveries that show how, no matter how much we dig, there's always something new to learn about our past. Shown is a mysterious organism that lived about 2.1 billion years ago. Scientists haven't determined whether the five-inch-wide life form was a colony of cells or an early animal. Link
(Image credit: Abderrazak El Albani and Arnaud Mazurier)