Modern Marvels: The solid form of life's precious elixir has played a key role in fashioning our history and is making its mark as an unusual tool of technology. Explore how Earth's ice originated and recount how ice age glaciers sculpted North America. Take an inside look at Colorado's National Ice Core Repository to see how ice drilled from Antarctica and Greenland is an invaluable archive of past climate, and at a Canadian research lab experts demonstrate the dynamics and dangers of icebergs. See how Greenland's massive ice sheet may be sliding faster than ever toward the sea. Take a look at how scientists are using Antarctica's ice as a gigantic lens to probe the secrets of the universe.