Climbing an iceberg in Antarctica with ice axes and crampons.
The waves off an iceberg in Antarctica can make it tricky to return to a motorized inflatable raft known as a Zodiac -- especially if you're wearing crampons, which are essentially knives on your feet.
Antarctic mountains are similar in feel to Himalayan mountains, although smaller, said our mountain guide, grandson of Tenzing Norgay.
Since this is saltwater, which has a lower freezing point that freshwater, it is colder than freezing here.
Tashi Tenzing, the grandson of Tenzing Norgay, the sherpa who took Edmund Hillary up Everest, has climbed Everest three times himself. Here he is making momos, a Tibetan dumpling.
Me at age 16, posing in front of Shaolin Temple. (Hey, I was 16.)
A piece of ancient ice more than 100,000 years old, some of the oldest ice in the Klondike. It may hold DNA from mammoths and other megafauna, preserved frozen since the middle Pleistocene.
A mummy from Siberia approximately 1,000 years old, originally found clad in copper masks, hoops and plates, burial rites that archaeologists say they have never seen before.
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ABOUT THE AUTHOR(S)
Charles Q. Choi
Charles Q. Choi is a frequent contributor to Scientific American. His work has also appeared in The New York Times, Science, Nature, Wired, and LiveScience, among others. In his spare time, he has traveled to all seven continents.