In the 1970s, scientists uncovered a set of fossilized footprints in Tanzania that were unlike anything seen before. Preserved in volcanic ash, they were left by early human ancestors more than 3.6 ...

In the video captured on Dec. 23, one man can be seen gesturing to the webcam operated by the U.S. Geological Survey.

Video shows a lone skier riding down Mount Etna in Italy while it erupted. The volcano, one of the world’s most active, saw days of activity before the eruption on Saturday.