Find out how some animals at Yellowstone National Park make fatal mistakes, and learn about the real reason why hot springs are so dangerous.

Learn how starfish got their shape after a complicated evolutionary process, starting with an ancestor that lived 500 million years ago.

Learn why a lichen found in the Mojave Desert has become key evidence in the search for extraterrestrial life.

Learn about the "pill-on-a-thread" that could replace endoscopies for half of all patients at risk of developing esophageal cancer.

Learn why the idea of an ancient African drying period is now being challenged and what this means for the story of the first humans.