"In 1999, to find out what really lies beneath our feet, scientists from Denver's Museum of Nature and Science dug a 2,256-foot well and found a surprising array of landscapes and animal life-all in one place. In addition to what they discovered in the sediment at that site, geologists were able to look at other findings in the area to pull together an amazing assessment of the geological history of Denver's Front Range. Today, those who visit the...

Yellowstone is home to North America's most iconic wildlife, and every year these animals must survive the Thaw-one of the harshest seasonal changes on Earth when temperatures can swing from minus 40°F in winter to almost 100°F in summer. Learn how animals cope with this range, and witness the impact on individual families of wolves, grizzly bears, beavers, and great gray owls.