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TIL that there is a power station in Greenwich which formerly powered London's trams and is now the central emergency power supply for London Underground, in case of loss of power from the National Grid

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XEA18 TIL that in 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
bxNj TIL that in the Indian state of Uttar Pradesh, many people bribe officials to declare their relatives legally dead, thus gaining ownership of their land. This led to the formation of an organisation called The Uttar Pradesh Association of Dead People, to advocate for those wrongly declare dead.
6rBm TIL a drug exists that has been shown to prevent HIV infection at a 92% success rate for gay men and a 70% success rate for intravenous drug users, but less than 1% of at-risk people currently take the drug and only 1/3 of primary care doctors have even heard of it.
BrnGr TIL Irish Actor Stephen Rea, who played an IRA soldier in The Crying Game (1992), was married for 17 years to convicted IRA bomber Dolours Price
LQ1YQ TIL That the white dried dog poop on lawns of the 70s and 80s was related to excess calcium in dog foods at the time. Less commercial bone meal in todays dog food recipes makes it virtually a thing of the past.