A one millimeter worm is helping scientists rethink what controls the pace of aging. By tracing how its tiny brain senses the ...

Light-sensitive stem cells let bristleworms grow their eyes for life, shedding new light on how vision evolved.

A strange, new species of ribbon worm, Pararosa vigarae, stretches its body like an accordion, capable of shrinking to ...

Scientists found that adult bristleworm eyes grow continuously thanks to a rim of neural stem cells similar to those in ...

There’s a yardstick among gardeners that good, rich soil with lots of actively decaying organic matter in it should have about a dozen or more earthworms (Lumbricus terrestris) in each cubic foot. But ...