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TIL that a glass ball will bounce higher than a rubber ball!

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kJQxd TIL In Britain a Marilyn is a mountain or hill that has a topographical prominence above 490 feet. A Munro is a mountain with elevation of over 3,000 feet
E1jMw TIL: Clinking glasses together dates back to medieval times when hosts would pour their guests wine into their glass as proof it wasn't poisoned. Over time this became a symbolic gesture and if the guest trusted their host they would just clink their glasses together instead as a symbol of trust.
EOoV TIL Kim Jong-il was granted 54 titles, including ‘Glorious General, Who Descended From Heaven’, 'Highest Incarnation of the Revolutionary Comradely Love’ and 'Amazing politician’.
4XxZa TIL that air traffic controllers get a break every 2 hours. When controllers remain "on position" for more than 2 hours without a break, performance can deteriorate rapidly, even at low traffic levels.
Bn1k TIL That an African grey parrot named Alex was the first, and only non-human animal, to ask an existential question: He asked what color he was.