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After the huge sell-off Wednesday, U.S. stocks fell sharply again Thursday. At one point, the Dow was down nearly 700 points. By late afternoon, it had regained some ground but closed down 546 points or a little more than 2 percent.

Over the past two days, the Dow has lost 1,378 points. The S&P 500 was down 2 percent for the day. The Nasdaq lost 1.25 percent.

Ensuring that people with pre-existing health conditions can get and keep health insurance is the most popular part of the Affordable Care Act. It has also become a flashpoint in this fall's midterm campaigns across the country.

And not only is the ACA protection, which mostly applies to people who buy their own coverage, at risk. It's also possible that pre-existing condition protections that predate the federal health law could be in play.

Updated at 5 p.m. ET

Search and rescue teams worked through the night in Florida to find people who need help, after Hurricane Michael hit the Panhandle as a historic Category 4 storm on Wednesday. Nearly 400,000 electricity accounts had lost power in Florida as of 3 p.m. ET Thursday.

It's hard to make time for history books when there is so much history crashing down on us every single day — and especially when that history is divisive, aggressive and seemingly never-ending.

A Soyuz rocket booster failed during the launch of a capsule carrying NASA astronaut Nick Hague and Russian cosmonaut Alexey Ovchinin on Thursday, forcing officials to abort their mission. The capsule made a "ballistic landing" and rescue teams recovered the pair, who are reportedly in "good condition," NASA says.

Hague and Ovchinin launched from the Baikonur Cosmodrome in Kazakhstan at 4:40 a.m. ET, heading to join the crew of the International Space Station. But more than a minute after launch, their Soyuz MS-10's booster failed.

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