National Geographic

Scientists have discovered evidence of what may be the world’s oldest known human burial. The 300,000 year-old Homo naledi remains show signs of having been intentionally buried in a chamber marked with symbols. But other scientists aren’t so sure.

​Many times, when new species are discovered, the characteristics that set them apart can only be appreciated by scientists. That isn't the case with the Ceratogyrus attonitifer tarantula, however – the thing has a long, soft horn protruding out of its back, and nobody knows why it's there.

NASA is dropping miniature robots down crevices inaccessible to humans as a way of extracting information about volcanoes on and off the Earth.