Most people know only two things about the appendix: You don’t need it – and if it bursts, you need surgery fast. That basic story traces back at least to Charles Darwin, the English naturalist who ...

For more than a century, the human appendix has been written off as a biological relic, a shrunken leftover from plant-eating ancestors that serves no real purpose. That view is now outdated. A ...

Our immune system relies on T cells to fight infections. But T cells don't just show up and react—first, they train, get a game plan, and coordinate their defenses in lymphoid organs. Researchers have ...