Banned from writing to loved ones, and only allowed letters from family members twice a year, prisoners in Soviet labor camps came up with many ways to squirrel out messages. With no pencils, papers or envelopes, they were forced to write on cigarette boxes, scratch out words on tree bark, or embroider messages with fish bone on tissues.

It’s the world’s oldest known geoglyph, but archaeologists have no idea what civilization was advanced enough to build it.

New blood samples have been discovered in the remains of a woolly mammoth, a long-extinct creature; experts began research this month in the hunt for live cells.

Scientists are close to precise dating of the Shigir Idol, thought to be twice as ancient as the Egyptian Pyramids. What do its inscriptions say?

Preserved by ice, the ancient woman, who died at the age of 25 and is covered in tattoos, used cannabis to cope with her ravaging illness.