The original version of this story appeared in Quanta Magazine. Once upon a time, long ago, the world was encased in ice. That’s the tale told by sedimentary rock in the tropics, many geologists ...

Hundreds of people gathered at the Plattsburgh City Beach on Saturday to intentionally jump into the chilly waters of Lake Champlain. The first such event since the pandemic drew some brave swimmers.

Lovers of winter swimming in costumes take a "bath" this month in the frigid Baltic Sea in Gdansk, Poland. Photo by Sergei Gapon Cold plunges, ice baths, polar plunges, Viking swimming...whatever the ...