Today's headlines from science and tech.

Here are today's most interesting science, health, and tech news reports. For analysis and commentary from around the Web, check out the  hot topics page. For Human Nature's takes, visit the blog. To add your own take, open or join a discussion thread in the Fray—and please link to the original story so others can participate intelligently in the conversation.

June 20

Evaporation confirms ice on Mars
(Kenneth Chang, New York Times)

Diet and exercise alter gene expression
(Dean Ornish et al, PNAS / Will Dunham, Reuters)

New California law makes cell-phone use a factor in charging drivers with manslaughter
(Ralph Vartabedian, Los Angeles Times)

British survey finds 28 percent of body piercings caused medical complications
(Angie Bone et al, British Medical Journal / Jeremy Laurance, Independent)

Gastric bypass surgery in fat people radically reduces breast and colon cancer
Thomas Maugh and Denise Gellene, Los Angeles Times)

Eight pregnant high-school girls admit they planned to conceive babies together
(Kathleen Kingsbury, Time)

Congress threatens to regulate performance-enhancing drugs in horse racing
(Joe Drape, New York Times)