Trump posted about a medical conspiracy theory called 'medbeds.' Here's what's going on. The Shutdown Showdown Is Almost Here. These Are the Economic Stakes.

Cultured neural tissues have been widely used as a simplified experimental model for brain research. However, existing ...

Most patterns eventually repeat themselves. But in the 1970s, mathematician Roger Penrose discovered a set of shapes that could cover an infinite plane without ever repeating. Known as Penrose tilings ...