The fossils found in the Burgess Shale include the 500-million-year-old ancestors of most modern animals
At about three inches long, Diagonella cyathiformis, or this “exquisite sponge” as Caron calls it, is nearly complete and consists of diagonally oriented spicules that form the skeletal elements of the body.
Want better willpower? Learn how to just say no with this step-by-step guide on boosting your self-control. In this one-minute video, Ask Smithsonian host Eric Schulze dishes on the science behind willpower – what saps it and what makes it stronger.