› added 1 year ago

115

TIL that Pilot FriXion ink is thermo-sensitive, and leave a notebook or homework near heaters or in a car on a hot day can make the ink invisible. To make the text reappear, you can simply put it in a freezer for a short period of time, the ink should reappear at around -10C/14F

Read more pilot-frixion.uk

via reddit.com

y7oX TIL the Empire State Building’s spire was originally designed to be a mooring mast for Zeppelin airships
k75g TIL that in 1950 ‘One of the largest human experiments in history’ was conducted on unsuspecting residents of San Francisco by the US military in a germ-warfare simulation and Nuremberg Code violation that utilized the Bay Area’s iconic fog to help spread two kinds of bacteria over the city.
NX70b TIL Bohemian waxwing can eat huge numbers of berries, more than double its own weight. Their large liver helps convert sugar to energy. They can metabolise ethanol produced from the fermentation of those sugary fruits more efficiently than humans, but may still become intoxicated, sometimes fatally
djAE TIL When jogging, British footballing legend Stanley Matthews would always wear shoes that contained lead, so that when playing football his feet would feel remarkably light, giving him the impression he could run and dribble faster.
9Y0GX TIL of the Trans Europe Foot Race where in the 2012 event competitors raced from Italy to Norway. German Peter Partel won with a time of 14 days and 18 hours to complete the 4175 km (2594 mile) course, averaging 283 km (176 miles) per day