[music] It's the 24th day of a 30-day expedition skiing across the Greenland ice cap, and I'm exhausted. Not because I've been skiing for 8 to 10 hours every day for the last 24 days. And not because the two sleds I'm pulling behind me are heavy, which they are.I'm exhausted because today it's too warm. [laughter] Instead of the sub-zero temperatures we've had for the last several weeks, today it's around freezing. And the snow is so Yeah, the snow is so sticky and wet that my skis no longer glide.They feel ...