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TIL that the time zone used on the International Space Station is Coordinated Universal Time, which is equivalent to GMT.

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XEXo6 TIL about Vacuum Airships which are a hypothetical type of airship which would use a vacuum instead of gas filled balloons to generate lift.
5YQdR TIL of the Pay It Forward Principle. This involves doing a good deed for three people and asking each of them do a good deed for three people and so on. After only 21 repetitions of this all 7.4 billion people on the planet would be reached by such a scheme.
v1R8L TIL of The McKee Sons, a freighter that ran aground in the Detroit River on Christmas Eve while delivering almost 12,000 tons of coal
GAwXN TIL A Blue Whale Eats 1 million calories on average daily
gMX4y TIL during the 2013 Westgate shopping mall attack in Kenya an ex SAS member and former Irish soldier joined forces to rescue victims of the shooting, organised police to attempt a counter attack and evaded gunfire while rescuing people still trapped in the mall