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LAS VEGAS — Mitt Romney appeared headed for a big victory in Saturday’s Nevada caucuses, an outcome that would give the former Massachusetts governor his second consecutive victory of the year and tighten his claim to dominant front-runner status in what has been a turbulent Republican presidential race.

The nation’s leading breast cancer advocacy group has gone into full damage-control mode.

Executives of the embattled Susan G. Komen for the Cure foundation held conference calls with affiliates Saturday to discuss a new strategy for working with supporters, a first step in rebuilding trust after this week’s public relations fiasco surrounding Komen’s off-then-on-again decision to fund Planned Parenthood.

KABUL — In a country where the recent past has unfolded like a war epic, officials think they have found a way to teach Afghan history without widening the fractures between long-quarreling ethnic and political groups: leave out the past four decades. 

When Hurricane Frances swept through the Caribbean in 2004, it wiped out populations of little anole lizards living on seven tiny islands in the Bahamas.

Instead of mourning the loss, Harvard University biologist Jonathan Losos spied an opportunity: He could, for the first time, test a controversial 70-year-old idea in evolutionary biology.

UNITED NATIONS — Russia and China on Saturday vetoed a U.N. resolution condemning Syria’s violent repression of anti-government demonstrators, effectively quashing efforts to isolate President Bashar al-Assad’s government as it intensifies a nearly year-long crackdown.