› added 5 years ago

148

TIL that the ‘sound’ produced by an ultrasound machine is made from applying an electrical current to piezoelectric crystals

Read more science.howstuffworks.com

via reddit.com

9YNDr TIL some spiders can live without food OR WATER for over two years. Years.
BrwEW TIL Lemmings do not engage in mass suicidal dives off cliffs when migrating. This misconception was popularized by the Disney film White Wilderness, which shot many of the migration scenes on a large, snow-covered turntable in a studio. Photographers later pushed the lemmings off a cliff
KYvkQ TIL red blood cells don’t have mitochondria or a nucleus
pYdee TIL that the immobilizing foam from Hulk (2003) is a real thing, often used to booby trap vehicles transporting nuclear weapons
Keg9 TIL that in United States military history, more citations for the Medal of Honor have been awarded for falling on grenades to save comrades than any other single act.