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.

The 20-something billionaires who run Kalshi and Polymarket are battling it out to be the top prediction market company.

Mud blister worms make their homes in the shells of oysters and other shellfish, where they weaken their hosts.