Despite the well-publicized risks of skin damage and cancer from too much sun, people continue to soak up ultraviolet radiation outdoors and in tanning salons. Now a new animal study adds to evidence that for some, tanning is truly an addiction.
In experiments with mice, scientists found that exposing the animals to a daily dose of UV light boosted their blood levels of beta-endorphins within a week. Beta-endorphins are "feel-good" hormones that act on the same brain pathways as so-called opioid drugs like heroin and morphine.
18:48 Animal rights activists claim major win in Ringling Bros. closing21
15:28 Animal activists finally have something to applaud at Ringling Bros. circus: its closure18
14:04 Nowhere left to run away to: The final days of the circus15
05:02 Ringling Bros. and Barnum & Bailey Circus to close after 146 years13