# Half-a-billion-year-old worm always turned right

A 500-million-year-old fossil worm shows a consistent right-turning bias, the earliest known example of handedness in animals. This discovery offers new insights into the evolution of complex neural systems and behavior.

**Importance:** 3/5

## Sources

### Science
- [New Scientist](https://www.newscientist.com/article/2533656-a-worm-that-lived-half-a-billion-years-ago-preferred-turning-right/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home) — Thu, 09 Jul 2026 11:32:02 +0100