A.M. Splash: Tiny Meteorite Hit House; Rain to Clear for Giants; Piedmont High Sex Competition Uncovered; Last Day for Voter Registration

A gray, 2-inch rock that hit a Novato home is the first confirmed chunk of the meteor that dramatically exploded over the Bay Area, a scientist said Sunday. Lisa Webber, 61, found the meteorite in her yard on Saturday, three days after the object fell onto the roof of her home on St. Francis Avenue. She had heard a strange sound at the time but didn't think twice about it until she read a Chronicle story saying debris from the meteor would be found in a band stretching east of San Rafael toward Napa and Sonoma.

The rain will be over by the time Giants pitcher Matt Cain takes the mound against the Cards Monday evening, forecasters said. The heavy rain will peter off early Monday afternoon and fade into intermittent showers across the region through Tuesday, maybe Wednesday, said Austin Cross, a forecaster with the National Weather Service.

An illicit competition to track sexual activity among the student body at Piedmont High School in a "fantasy league" is an "awful" revelation, but can be used to foster education and conversation among students and parents, a school district official said Sunday. The "league" was run by male students, who "drafted" unknowing female students to their teams, then tallied points for "documented engagement in sexual activities" with those students, according to a letter Principal Rich Kitchens sent to parents Friday. The league's existence was first tipped to officials by students who came forward after a date-rape prevention assembly in early October.

Monday is California's deadline to register to vote in the Nov. 6 presidential general election. And if you haven't done so already, you probably can do it right now from the comfort of your own home. Any mail-in applications postmarked by Monday are fine, but if you're registering online at RegisterToVote.ca.gov, your application must be submitted -- not just started but completely finished -- by midnight Monday.

Crews broke ground Friday on a $54 million Solar Energy Research Center at the Lawrence Berkeley National Laboratory. McCarthy Building Companies, Inc. began building a three-story, 40,000-square-foot facility that will be devoted to researching and developing transportation fuels from sunlight using photovoltaic and electrochemical solar energy systems, according to a company news release. The project is scheduled to be completed in late 2014.

Yahoo's Marissa Mayer in spotlight Monday (SJ Mercury News)

Wall Street is waiting to hear from Marissa Mayer. And so is Silicon Valley. The Yahoo CEO is expected to make her first public remarks Monday during the company's quarterly financial conference call, three months after she became the latest in a series of chief executives hired to reverse a long decline at the once-pioneering Internet giant. Since she was recruited from Google in July, the 37-year-old Mayer has shaken up Yahoo's top management, taken steps to improve morale and even given birth to a baby boy -- returning to work after just two weeks' maternity leave. But despite some leaked hints about improving Yahoo's websites and developing mobile services, Mayer has largely kept her plans under wraps.

Overnight rain dampening the North Coast and its unpicked grapes won't dampen the spirits of grape growers, winemakers and winery owners buoyed by what they're calling the best harvest in years. About one inch of rain is expected to fall, most of it coming this morning. Tuesday and Wednesday could have showers off and on coupled with cool afternoons and cold mornings.

Big changes are coming to San Francisco’s most heavily traveled and historic bus line – but few people know about them, according to a new survey of transit passengers. Plans to install two separated bus-only lanes on Geary Boulevard to speed up the 38-Geary line have been in the works for years and are now advancing slowly toward reality. But of 600 riders surveyed this summer, 57 percent had not heard about the project, according to the results released earlier this month by the San Francisco Transit Riders Union, a group that advocates for Muni riders.