Period between the use of the first stone tools, c. 3.3 million years ago, and invention of writing systems, c. 5,300 years ago.

The start of a new series by Shanti, titled Humans Are Still Young. “Every carbon atom in every living thing on the planet was produced in the heart of a dying star,” says Brian Cox in Wonders of the Universe.

Discovery News reports about a Bronze Age version of Facebook that has emerged from granite rocks in Russia and northern Sweden: A thousands-of-years-old timeline filled with an archaic version of the Facebook “like.”