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TIL In 2015, the UK government paid off its remaining debt of £1.9bn from World War One

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nQDb TIL blue light scatters the most in the atmosphere and is therefore least visible by aircrafts at night. 1939 German engineers knew that and installed blue lights on their emergency vehicles, to be spotted less easily by bombers. This is the origin of the blue emergency light.
69EO8 TIL The Halifax Explosion was the largest man made explosion in recorded history up until that point. Explosives were measured in “Halifaxes” afterward. The first atomic explosion was 10 Halifaxes.
JYdnj TIL The Fisher Pen Co. patented a sealed, pressurised ink cartridge for the anti-gravity pen in 1966. The "thixotropic” ink is close to a solid before being stirred & as it's stirred by the ball going through the point, it becomes very thin which allows it to flow in the gravity-free vacuum of space
Yj0x TIL beards and long dresses fell out of fashion during the 1900s due to public health campaigns about spreading tuberculosis and other infectious diseases. Prior to germ theory and vaccines, people thought beards and fabric protected against miasma and “bad air”.
OoWBY TIL John Candy was paid only $414 for his role in Home Alone. He was only available for 1 day, and his scenes took 23 hours to shoot.