WASHINGTON, D.C.

Set the clocks ahead one hour this weekend

It’ll be a sleepy Sunday morning for millions of Americans, who will lose an hour’s sleep this weekend with the return of daylight-saving time.

Officially, clocks for most of the country change at 2 a.m. Sunday.

Daylight-saving time brings an extra hour of evening sunshine until Oct. 31, when standard time returns.

Safety advocates say it’s also a good time to replace batteries in smoke detectors.

Some parts of the nation don’t observe daylight-saving time. They include Arizona, Hawaii, the part of Indiana in the Eastern time zone, Puerto Rico, the U.S. Virgin Islands and American Samoa.

California

Mars rover finds more signs of past water

NASA’s Spirit rover uncovered more evidence that there was once water on Mars, although not in the quantities its twin Opportunity found traces of halfway around the planet last month, the space agency said Thursday.

Spirit found clues that limited amounts of water altered a volcanic rock, coursing through tiny fissures that crisscross the boulder and cementing together the multiple layers that mask its surface.

The findings were made during a weeklong analysis of the rock in the Gusev Crater region where Spirit landed Jan. 3.