The length of a music single was determined by the weight-driven pulley system on a 1920’s recording machine — it allowed approximately three and a half minutes to record before a 100 pound weight hit the floor.
Sherlock Holmes gets a lot of mail. What happens to it?
Seventeenth-century infertility remedies.
How tech’s richest plan to save themselves after the apocalypse.
A free online course offered by MIT: How to Win at Texas Hold ’Em.
ICYMI, Friday’s links are here, and include a brief history of prosthetic limbs, the anniversary of the 20th of July plot (the unsuccessful bomb attempt to kill Hitler in 1944), the science of the perfect s’more, and an analysis of the Bayeux Tapestry’s 93 penises.