70 years of the interstate: How the US highway system built the America we know

Seventy years ago, on June 29, 1956, President Eisenhower signed the Federal-Aid Highway Act of 1956, aka the National ...

80 million trees were wiped out in seconds in Siberia after a space rock explosion more powerful than the Hiroshima bomb, but scientists never found a crater

An explosion powerful enough to destroy millions of trees should have left behind a giant crater. Instead, when scientists ...