Maxed out = Challenging limit?

Context:

Maxed out: How cold can you get and live?
22 April 2010 by James Mitchell Crow
Magazine issue 2756. Subscribe and get 4 free issues.
Humans hate being cold, and for good reason: our long-limbed bodies are exquisitely adapted to lose heat, not to retain it. This makes perfect sense in the intense heat of the African savannah, where humans evolved. Without our technological adaptations to cold - clothing, heating, shelter - that's where we'd all still be living, says Mike Tipton of the University of Portsmouth, UK, who studies human thermoregulation.