TIL of physicist Lene Hau, who in 1999 led a team at Harvard University that was able to slow down a beam of light to 38mph and in 2001 they successfully stopped a beam of light.

TIL of physicist Lene Hau, who in 1999 led a team at Harvard University that was able to slow down a beam of light to 38mph and in 2001 they successfully stopped a beam of light.
Original source.
(Via r/todayilearned/)
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