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TIL that during "the Emergency", a political crisis in India which saw civil liberties being curtailed, the newspaper Indian Express protested against ongoing press censorship by publishing a fully blank front page editorial.

GY1Y1 TIL American captives in the Vietnam war would authenticate a new prisoner’s American identity by tapping the first five notes of “Shave and a Haircut”, against a cell wall, and waiting for the appropriate response
yVeda TIL Fungi communicate with each other through electrical signals carried by underground filaments. Scientists studying these networks have identified common signal patterns that make up a vocabulary of up to 50 “words”
BrZyL TIL Over-cooking hard boiled eggs will typically result in a thin green iron(II) sulfide coating on the yolk. This reaction occurs more rapidly in older eggs as the whites are more alkaline.
gD07 TIL: In 2008 two judges were found to be accepting money from two juvenile detention centres in return for increasing the number of residents, offences were as minimal as mocking a principal on Myspace, trespassing in a vacant building, or shoplifting DVDs from Wal-mart .
1anND TIL Scientists have discovered that the gut-infecting bacterium C. diff is evolving into two separate species, one group highly adapted to spread in hospitals. Researchers identified changes that allow it to thrive on a Western sugar-rich diet, evade common hospital disinfectants and spread easily.