Imagine a 1,000-foot wall of water racing toward the U.S. It sounds like science fiction. But in 1958, a mega-tsunami in Alaska reached over 1,700 feet high. Scientists say under the right conditions, ...

A wall of water taller than most skyscrapers roared through a remote Greenland fjord, yet the strangest part of the story unfolded after the splash. A NASA satellite watched the tsunami’s energy get ...