Autonomous vehicle trainer Alex Kexel (right) and operations team lead Roy Ysmael (second from left) prepare cars for test drives at Cruise Automation. General Motors bought the company last year. Autonomous vehicle trainer Alex Kexel (right) and operations team lead Roy Ysmael (second from left) prepare cars for test drives at Cruise Automation. General Motors bought the company last year.

President Trump issued this tweet in response to the women's marches across the country to protest his presidency. Celebrities joined in throngs at these marches, including Madonna, Julia President Trump issued this tweet in response to the women's marches across the country to protest his presidency. Celebrities joined in throngs at these marches, including Madonna, Julia Roberts, Katy Perry and Amy Schumer.

Brandless’ Lab where it display its products in San Francisco. Brandless’ Lab where it display its products in San Francisco. Snacks line the walls of Brandless’ Lab where the company displays their products in San Francisco. Snacks line the walls of Brandless’ Lab where the company displays their products in San Francisco. Brandless’ personal care line at the Lab where the company displays their products in San Francisco.

Co-founder Mike Krieger, engineer Shayne Sweeney, CEO Kevin Systro and director of community Josh Riedel take a break from their Instagram office in San Francisco in 2011. Co-founder Mike Krieger, engineer Shayne Sweeney, CEO Kevin Systro and director of community Josh Riedel take a break from their Instagram office in San Francisco in 2011. Uber support representatives wait to help customers at the Uber Partner Support Center in San Francisco.

Grant Strain, a budtender, shows cannabis products at the Cannabis Buyers Club of Berkeley (CBCB) on Thursday, Nov. 2, 2017, in Berkeley, Calif. The dispensary is located at 3033 Shattuck Ave. Grant Strain, a budtender, shows cannabis products at the Cannabis Buyers Club of Berkeley (CBCB) on Thursday, Nov. 2, 2017, in Berkeley, Calif. The dispensary is located at 3033 Shattuck Ave. Some Cannabis plants at the Cannabis Cup event in the Sonoma County Fairgrounds in Santa Rosa, Calif.

Fifteen year old Quinsi Dominguez (center) answered a question from Marc Benioff (left) as Mayor Ed Lee listens at a community meeting in 2015. Fifteen year old Quinsi Dominguez (center) answered a question from Marc Benioff (left) as Mayor Ed Lee listens at a community meeting in 2015. Marc Benioff, CEO of Salesforce, praised Mayor Ed Lee, who died early Tuesday, for his leadership and his kindness. Lee urged Benioff to focus on improving the city’s schools.

Voyage Operational Specialist Mark Kirk discusses how the robot taxi service works with Villages Golf & Country Club resident Jerry Neece. Neece was impressed when on a recent ride, his self-driving car spotted ... more Voyage Operational Specialist Mark Kirk discusses how the robot taxi service works with Villages Golf & Country Club resident Jerry Neece. Neece was impressed when on a recent ride, his self-driving car spotted two deer and stopped well before they sauntered into the roadway.

President Trump hosts Republican senators to discuss tax and trade issues over lunch at the White House in Washington on Dec. 5. The House version of the tax bill would eliminate the AMT, but the Senate version ... more President Trump hosts Republican senators to discuss tax and trade issues over lunch at the White House in Washington on Dec. 5. The House version of the tax bill would eliminate the AMT, but the Senate version does not.

Tommaso's a North Beach Restaurant with a brick oven, shown on September 22, 1987. Georgio Crotti holds a world famous pizza from Tommaso's,surrounding him are Anna (with glasses, the mom) Carmen and Agostino ... more Tommaso's a North Beach Restaurant with a brick oven, shown on September 22, 1987. Georgio Crotti holds a world famous pizza from Tommaso's,surrounding him are Anna (with glasses, the mom) Carmen and Agostino Crotti.

Crowds wait for the start of a Mozilla press conference at Mobile World Congress in 2013. Mozilla and Yahoo, former partners, are locked in a legal dispute. Crowds wait for the start of a Mozilla press conference at Mobile World Congress in 2013. Mozilla and Yahoo, former partners, are locked in a legal dispute. Mozilla on Tuesday sued Yahoo for breaching a 2014 contract, seeking a payout that could amount to hundreds of millions of dollars.