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Helion, an Everett, Wash.-based nuclear fusion startup, raised $500 million in Series E funding at a $3 billion post-money valuation led by former Y Combinator president Sam Altman.

Why it matters: Nuclear fusion is the holy grail of clean power tech, as it could eliminate both supply constraints and carbon emissions.

Other investors include Dustin Moskovitz, Mithril Capital and Capricorn Investment Group. The round also includes up to another $1.7 billion in milestone-based investment.

The bottom line: This is the largest-ever VC investment into nuclear fusion, and Altman's largest-ever personal investment.

Go deeper

Dan Primack, author of Pro Rata
Updated 20 hours ago - Politics & Policy

Trump social media group raises $1 billion from undisclosed investors

Illustration: Sarah Grillo/Axios

Donald Trump's social media startup on Saturday announced that it secured $1 billion in new investment as part of its ongoing efforts to become publicly traded via a blank check company.

Between the lines: None of the investors were identified, which is highly unusual for this sort of transaction.

Movie theaters go out of style

Illustration: Sarah Grillo/Axios

Vaccination rates are going up, people are going out to restaurants again — although the new COVID variant may get in the way — but they still aren't rushing back to the movies.

By the numbers: Some 49% of pre-pandemic moviegoers are no longer hitting theaters, according to a study from the film research company The Quorum, as reported by the New York Times.

2 hours ago - Health

Vaccine mandates lose steam in the U.S. while Europe doubles down

Illustration: Sarah Grillo/Axios

European countries are doubling down on pressure campaigns to get people vaccinated just as Republicans continue to wage war — often successfully — against vaccine mandates in the U.S.

Why it matters: The starkly different approaches create a sharp contrast between the regions' approaches to vaccination, even as the Omicron variant rapidly spreads around the world.