Clues from a crater-like sinkhole on the island of Kauai point back to a giant wave that came from Alaska at about the time European explorers were pushing west, seeing the Mississippi River for the first time.
On March 27, 1964, California geologist George Plafker was attending a research conference in Seattle when news came of a big earthquake in Alaska.
When people first walked across the Bering Land Bridge thousands of years ago, dogs were by their sides, according to researchers who wrote a paper published in the journal Science.
As Gary Carver stepped through the grasses of a treeless Alaska island with an archaeologist friend, he spotted a bleached driftwood log. The log rested on sand about a half mile from the beach and 50 feet above sea level.