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TIL 49.2% of the population of Niger is under 15 years of age.

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A5gw TIL that if you hyperventilate before swimming underwater or diving, you artificially reduce the amount of CO2 in your bloodstream, preventing the body’s ‘urge to breathe’ trigger, making you blackout and rapidly drown without warning.
ADZEa TIL American WWII pilot Charlie Brown was struggling to keep his damaged bomber airborne in the skies over Germany in 1943 when Luftwaffe ace Hanz Stigler flew alongside. Instead of firing due to how much damage the bomber had taken as he thought it would be dishonorable, Stigler gave a salute.
bQBj TIL That clouds typically weigh about a million pounds.
neLmG TIL that the worst all-time storm (wind speed) is Typhoon Haiyan in the Philippines, 2013 (aka Yolanda). No other storm got to 315km/h (195mph) and sustained it for 1 minute. Damage included ~8,000 dead and missing people. Post-storm, some regions were on the brink of Anarchy and looting was common.
mxy1R TIL the Crusaders planned to finance the Fourth Crusade by stopping first in Constantinople, to assist in a coup. When they were not fairly compensated by the new Byzantine Emporer, they seized control of the city and surrounding territory. Establishing the short-lived Latin Empire (1204-1261).