Number of the day $40 million That’s how much of his own money Tesla CEO Elon Musk says he has spent on the Boring Co., which he started after becoming frustrated with traffic. Tuesday night, Musk unveiled his first effort at a network of tunnels that will whisk autonomous, electric cars — not just Teslas — underneath Los Angeles with guide wheels attached to the front tires.

Musk’s big spend; Blue Apron becomes penny stock; ex-Uber exec drives startup

The San Francisco Chronicle is the Bay Area’s premier news source, providing an authoritative voice that lends context and depth to the conflicts and changes that shape the region. Our coverage aims to make readers feel smarter about the important issues of the day. Beats are covered through the prisms of change, conflict and power, without losing sight of the quirky and eclectic stories that make the Bay Area unique.     A SpokenEdition transforms written content into human-read audio you can listen to anywhere. It's perfect for times when you can’t read - while driving, at the gym, doing chores, etc. Find more at www.spokenedition.com

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The San Francisco Chronicle is the Bay Area’s premier news source, providing an authoritative voice that lends context and depth to the conflicts and changes that shape the region. Our coverage aims to make readers feel smarter about the important issues of the day. Beats are covered through the prisms of change, conflict and power, without losing sight of the quirky and eclectic stories that make the Bay Area unique. A SpokenEdition transforms written content into human-read audio you can listen to anywhere. It's perfect for times when you can’t read - while driving, at the gym, doing chores, etc. Find more at www.spokenedition.com

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Musk’s big spend; Blue Apron becomes penny stock; ex-Uber exec drives startup

Musk’s big spend; Blue Apron becomes penny stock; ex-Uber exec drives startup