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Grand Canyon Opens Skywalk (0:43)
Watch this video about the Grand Canyon Skywalk on HowStuffWorks. American Indian elders and a former astronaut took the ceremonial first steps on a glass-bottomed walkway perched 4,000 feet over the Grand Canyon. See how the Grand Canyon Skywalk... More »
Assignment Discovery: Yellowstone (1:13)
On the Discovery Channel series, "Assignment Discovery," scientists agree that there is volcanism in Yellowstone, and we could experience an eruption any time.
Understanding: Fire at Yellowstone Park (2:08)
In the summer of 1988 Yellowstone Park caught fire. Usually Yellowstone trees are too wet to catch fire. This time however, conditions were different. Learn more about the fire on TLC's "Understanding."
Caught in the Moment: Khao Yai National Park (0:35)
Khao Yai National Park is Thailand's oldest park. It features true rainforests that have been unaffected by man. Learn more on Animal Planet's "Caught in the Moment."
Assignment Discovery: Yellowstone's Super Eruption (0:54)
If the Yellowstone super volcano erupts, global temperatures could drop as much as twenty five degrees changing life on earth forever. Learn more on Discovery Channel's "Assignment Discovery."
