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TIL Refracting telescopes use the original telescope design by Galileo, with two lenses in a hollow tube. They can provide a crystal clear image for observing close celestial objects like moon and planets but not good for for deep sky objects, unlike reflector telescopes

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D1Vyr TIL humid air is lighter than dry air. This is why low-pressure areas (L) bring the rain, not the high-pressure areas (H). And this is because water (H2O) molecules are actually lighter than Oxygen (O2) and Nitrogen (N2) that make up the atmosphere.
16nBX TIL drying hands is as important as washing them
P1KPn TIL when William I, German Emperor, was crowned King of Prussia on 18 October 1861, it was the first coronation of a Prussian King since 1701 and the first of a German King since 1806
nWBDB TIL Light travels at a constant speed of 1,079,252,848.8 (1.07 billion) km per hour. That works out to 299,792,458 m/s, or about 670,616,629 mph (miles per hour)
N7JkN TIL that in the post-war Soviet Union, Russian mafioso that joined the army were referred to as "suka", or bitch, for allying with the government. The outcast suki formed their own gangs which became powerful enough to fight the original gangs. Their fighting is known as the "Bitch Wars".