Here’s what happens when you crack your knuckles, including the researcher who cracked the knuckles in one hand only for over 60 years to see if he’d get arthritis. Related: The Science of Knuckle Cracking.
How a Guy From a Montana Trailer Park Overturned 150 Years of Biology.
April 22 is Earth Day: Here’s the story of the co-founder who killed then composted his girlfriend.
Inside the FBI’s Colossal Pre-Computer Fingerprint Factory.
Artificial Heart Update: A simple artificial heart could permanently replace a failing human one.
ICYMI, Wednesday’s links are here, and include the anniversary of the 1906 earthquake and fire that destroyed 80 percent of San Francisco, that time Kansas locked up more than 5,000 women and girls for having STDs, why it’s almost impossible to throw a 110 mph fastball, and “T’was the eighteenth of April in seventy-five”: the midnight ride of William Dawes and Samuel Prescott (and Paul Revere).