Right now, a wall of ice nearly two miles thick is covering the land where Chicago used to be. And it has been moving across the continent for 20,000 years without ever stopping. At the peak of the ...

Add Yahoo as a preferred source to see more of our stories on Google. During ice ages, ice sheets like the one in Greenland have covered much of Earth's surface. Thor Wegner/DeFodi Images via Getty ...

Why would a scientist get excited about 20,000-year-old poop? In this episode of the Wild Critters USA series on Orbit, families join the U.S. National Park Service discovering what mummified mammoth ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. How many ice ages has the Earth had, and could ...