Waiting for the weekend can often seem unbearable, a whole seven days between Saturdays. Having seven days in a week has been the case for a very long time, and so people don’t often stop to ask why.

Neil deGrasse Tyson explains how the seven-day week arose from ancient astronomy, with each day named for classical planets ...

The week is seven days long. Don’t let The Beatles confuse you otherwise. And if we were all just chilling in caves, eating bugs, and painting on the walls, the seven days wouldn’t matter. But that ...