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TIL there's 20-40x less oxygen in water than air.

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kJZN1 TIL about the water-level task, which was originally used as a test for childhood cognitive development. It was later found that a surprisingly high number of college students would fail the task.
OoKnY TIL that trains on the Mauritania Railway are up to 3 km (1.9 mi) long, making them one of the longest and heaviest in the world. 200 to 210 cars are used to transport iron ore, though passengers are also occasionally transported.
vGR TIL that in 2001, Slash (guitarist) was diagnosed with Cardiomyopathy due to drugs and alcohol abuse. He was given between 6 days and 6 weeks to live. He survived and now has a defibrillator implanted inside him.
0dW81 TIL An engineer named Walter "Taffy" Holden accidentally took off in a military jet without knowing how to fly it
mx5Vy TIL in the 1950s, when Polio was an epidemic, people who used iron lungs had to click to signal a nurse when they couldn't breathe after power went out. Then a nurse would come and manually operate the machine.