Millions of sperm do not always compete alone—some species send them into action as coordinated teams. A sweeping evolutionary study

Genetic changes may set off a chain reaction that causes the spine’s natural shock absorbers to harden and deteriorate. Zebrafish

A long-term brain study found that common risks such as smoking, high blood pressure, heart disease, and high blood lipids

A new hollow nanoreactor mimics living cells to make hydrogen peroxide more efficiently using visible light. Its light-trapping cavity and

A supermassive black hole has been found lurking about 30,000 light-years from the center of its galaxy—the first dormant black