Circadian rhythms, or cycles of activity during a 24 hour period, are highly conserved across species.   While we have much to learn about these daily patterns of life, scientists have found an organism that may offer new insight.

The timing of this internal clock is related to the amount of exposure to light.  How do circadian rhythms work in organisms that are not exposed to light?  A Somalian cavefish, Phreatichthys andruzzii, is a blind species that has been living without light for approximately 1.4 to 2.6 million years!

Researchers compared the cave fish to zebrafish during exposures to 12 hour period of More >