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Polymarket's Shayne Coplan (left) and Kalshi's Tarek Mansour are two 20-something billionaires who run the biggest prediction market sites. They have had a long-running rivalry.

2 young billionaires are behind the prediction market boom. They hate each other

The 20-something billionaires who run Kalshi and Polymarket are battling it out to be the top prediction market company. Observers and former insiders say the feud is just heating up.

Netia McCray stands outside the Museum of Science, where she runs a STEM educational program for teens, in Boston, Mass. McCray has been suffering from long COVID since 2020.

The U.S. relied on these science advisers. Then the Trump administration cut them

The federal government recruits top experts to volunteer to advise on pressing research issues of the day. Since President Trump took office, hundreds of these experts have been dismissed.

The Pentagon has now ID'd all 6 U.S. soldiers who died in a Kuwait attack

The last two names of the six U.S. soldiers killed in a Kuwait attack have been released by the Pentagon, and they are from California and Iowa. They died Sunday when a drone hit a command center in Port Shuaiba, Kuwait.

For the first time in nearly 6 decades, a Syrian president steps up to speak at the U.N.

Turning the page on decades of distance, Syria's President Ahmad al-Sharaa addressed the U.N. General Assembly, marking the first time any president from his country has done so in almost 60 years.

Portugal observes national day of mourning as Lisbon streetcar death toll rises to 17

The streetcar's crumpled wreckage was still on the downtown road where it crashed Thursday. Officials declined to speculate on whether a faulty brake or a snapped cable may have caused the accident.

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