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TIL that methane bubbles can become frozen in place in many lakes such as Lake Baikal in Russia. The ice thickness there can reach 2 m/6.5 ft during the peak of winter coldness, trapping millions of cubic feet of methane gas under the ice until Spring arrives.

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rb91 TIL A Dutch door is a door divided horizontally in such a fashion that the bottom half may remain shut while the top half opens. The initial purpose of this door was to keep animals out of farmhouses, or keep children inside, while allowing light and air to filter through the open top.
kLgm TIL: There are still people around with plutonium-powered nuclear pacemakers implanted in their bodies. 9 were still working as of 2007, 35 years after implantation. They work on the same thermoelectric principle as the New Horizons spacecraft’s power source.
14jW TIL that the average private school teacher makes $14,000 less per year than the average public school teacher
0dQAv TIL of 'rubber soldiers' - Brazilians conscripted by their government during World War II to harvest rubber in the Amazon for the war effort. Approximately 30,000 died from rough conditions and disease - more than the total number of solders Brazil sent to fight overseas during the war.
wLO4o TIL that a "paracosm" is a detailed imaginary world that many people have, often developed during childhood and can continue for a long period of time, e.g. into adulthood. The paracosm may incorporate real-world or imaginary characters and conventions.