News Life In the dark, cave fish follows its own rhythm An odd biological clock may help elucidate how daily cycles are set Share this:FacebookTwitterPocketRedditPrintEmail By Tina Hesman Saey September 6, 2011 at 5:28 pm This article is only available to Science News subscribers. Subscribers, enter your e-mail address to access our archives. Client key* E-mail* Log in Not a subscriber? Science News is a nonprofit. Support us by subscribing now. Subscribe