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TIL the reef stonefish (Synanceia verrucosa) is not only a master predator but one of the most venomous fish in the world, even lethal to humans. Its appearance is that of a crusty rock affording the fish uncanny camouflage. Each of its 13 dorsal spines has two venom sacs containing 3 deadly toxins.

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mmMR TIL general Erwin Rommel found himself several times behind Allied lines. On one occasion, he stumbled across an allied field hospital. They were low on supplies and he promised to bring medical supplies, after which he drove off unhindered. Later he returned with the promised medical supplies
woEmP TIL that monitoring cough via daily used smart devices (smartphones, wearables, among other) can predict and prevent COPD exacerbations, reducing hospitalisations.
kO59m TIL of the Battle for Texel, the last european battle of World War 2.
eGX4 TIL In 1990 a man jumped into a Detroit Zoo Chimpanzee enclosure to rescue a drowning chimp
91oB TIL that in the UK, the opposition is formally called “Her Majesty’s Most Loyal Opposition”