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TIL it's possible for complex communications with someone who is dreaming. Researchers of one study found two-way communications during REM sleep is possible when study participants (having confirmed lucid dreams) answered questions correctly via eye movement - even solving simple math equations.

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QJO5E TIL that the first scientific paper on the greenhouse effect was published in 1856 by a female scientist, Eunice Newton Foote
d81J9 TIL about the Sole Survivor Policy in the United States military, which protects "only sons/daughters", "the last son/daughter to carry the family name", and "sole surviving sons/daughters" only during peacetime.
loGyV TIL that the character Tinky Winky from the British TV series 'Tellytubbies' was attacked by the religious right in America for being a "gay role model".
BrLre TIL that these rectangular plates on sidewalks are to warn people with vision impairment that they are about to walk out onto a street.
ew8g TIL Earth’s rotation is slowing at a rate of approximately 17 milliseconds a century, and the length of a day for the dinosaurs was closer to 22 hours.