Dust spawned by a gigantic collision in the asteroid belt between Mars and Jupiter 400 million years earlier triggered an ice age.
20 Sep 2019 9:04 AM
Little is known about the Denisovans, who were ancient relatives of the more familiar Neanderthals and our own species.
20 Sep 2019 8:58 AM
Visitors descended early in the day on the tiny desert town of Rachel, a short distance from the military site.
20 Sep 2019 8:51 AM