For millennia, people slept in two shifts – once in the evening, and once in the morning. But why? And how did the habit disappear?

Alt: Pingu grumpily slapping glitter and hearts on a piece of paper

Alt: Sadness is crying and says I don’t want to work tomorrow.

Alt: kermit the frog is typing on a typewriter in a messy room .

Hi everyone, I'm Rhonda, also known as R. S. A. Garcia, a speculative … Arula Ratnakar needs your support for Help R. S. A. Garcia Pay for Cancer Expenses

Look up! The Geminds could put on quite the show tonight despite the bright moon.

Alt: Armageddon Karl GIF. Text says “Get the book!” Three times. It’s dark, dingy, gray and creepy. Someone slams a door. A dude is in a chair.

Alt: A tabby kitten with very short legs and an upright, triangular tail waddles towards the camera. An illustrated overlay of garlands, ornaments and a Christmas tree star is overlaid over its tail to create the illusion of a small Christmas tree on its back. At the bottom of the image, "Have a Meowy Christmas!" is written in white text.

A big stack to close out the year with