The Hallucigenia sparsa worm had quite a grin — a circular mouth lined with needlelike teeth. More teeth lined the inside of its mouth and throat, researchers found.
Credit: Danielle Dufault
View full size image
Heads or tails? Scientists finally have an answer in the case of the odd ancient worm...
Everyday Feminism, which "has quickly become one of the most popular feminist digital media sites in the world" according to its website, has banned "trigger warnings" as the warnings themselves could be triggering.
