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Mr. Musk’s involvement in right-wing politics contributed to a 13% drop in deliveries in the first quarter, including steep declines in E.V.-friendly places like Norway.

The co-founder of Oracle and friend of President Trump, who was a flamboyant fixture in the 1990s, has returned to the spotlight through — of all things — TikTok.

They are expected to convene on Wednesday to discuss a potential sale of the app, which faces a Saturday deadline to change its ownership structure.

Sales of cars picked up recently partly as buyers rushed to lock in deals before President Trump’s 25 percent tariffs on cars and auto parts go into effect.

In Britain, amid growing evidence of harm to young people from extreme content online, a “Smartphone Free Childhood” campaign is going viral.

The start-up’s valuation, which has nearly doubled in six months, shows continued enthusiasm for A.I. among investors.

The company, which uses artificial intelligence to develop new treatments, now counts the venture capital firm Thrive Capital as a backer.

Eric Trump and Donald Trump Jr. are investing in a Bitcoin-mining company called American Bitcoin, created by the merger of two firms.

Nvidia showcased robots that could work in warehouses, pedal around like “Star Wars” droids and manipulate surgical equipment at its weeklong A.I. conference

Carmakers are likely to face higher costs regardless of how they respond to President Trump’s 25 percent tariffs on cars and auto parts.