The recent discovery of the oldest-known vertebrate brain is giving scientists valuable insights into the evolution of the ray-finned fish species. The diverse group comprises about 50 percent of living vertebrate species. They include everything from trout to salmon and goldfish to seahorses.
A mastodon named Fred, also known as the Buesching mastodon, is a distant relative of the modern elephant. His remains reveal the story of his life and violent end.