title: The Jellies That Evolved a Different Way To Keep Time
author: Marlowe Starling
contenttype: article
publication: Quanta Magazine
published: 2026-03-20T14:25:33+00:00
sourceurl: https://www.quantamagazine.org/the-jellies-that-evolved-a-different-way-to-keep-time-20260320/
word_count: 73
The passage of the sun across the sky — dawn, day, dusk, night — drives the clock of life. Some species wake with the sun and sleep with the moon. Others do the opposite, and a few keep odd hours. These naturally driven, 24-hour biological cycles are known as circadian rhythms, and they do more than cue bedtime: They regulate hormones, metabolism, DNA repair, and more. When life falls out of sync… Source