Ajit Pai @AjitPai
OTD in 1983, the General Conference of Weights and Measures redefined the meter to be the distance light travels in a perfect vacuum in 1⁄299792458 of a second. (Very first definition in 1793: 1⁄10000000 of distance from equator to the North Pole along meridian through Paris.) https://t.co/ScrjIoWDYo — PolitiTweet.org