Floating to the North Pole in a Hydrogen Balloon Isn't as Good an Idea as You'd Think

Between the ship-crushing ice floes, polar bear attacks and maddening quiet, exploring the Great White North in the 19th Century was not a recommended endeavor. But still hundreds of intrepid adventurers tried—and many died. But one Swede thought he had the answer: simply float above the tundra in a gas-filled… »2/02/12 5:00pm2/02/12 5:00pm