Scientists placed two clusters of cultured forebrain cells side by side (each cluster the size of a head of a pin). Within days, the "minibrains" had fused and particular neurons (in green) migrated from the left side to the right side, as subsets of cells do in a real brain.
Courtesy of Pasca lab/Stanford University
(Left) A close-up view of a spirally fractured mastodon femur. (Right) A boulder discovered at the Cerutti Mastodon site in San Diego County thought to have been used by early humans as a hammerstone.
Tom Démeré/San Diego Natural History Museum
In "The Fish on My Plate," author and fisherman Paul Greenberg sets out to answer the question "what fish should I eat that's good for me and good for the planet?" As part of his quest to investigate the health of the ocean — and his own — Greenberg spent a year eating seafood at breakfast, lunch and dinner.
Courtesy of FRONTLINE
Astronaut Peggy Whitson became NASA's astronaut with the most time in orbit Monday. She is seen here earlier this year, along with fellow astronauts, in the Quest airlock of the International Space Station.
Bill Nye the Science Guy arrives to lead scientists and supporters down Constitution Avenue during the March for Science on Saturday in Washington, D.C. The event is being described as a call to support and safeguard the scientific community.
Jessica Kourkounis/Getty Images