RT @ScienceChannel: The first written record of the law of friction was just found in da Vinci’s old notebook. bit.ly/2aniXLA https://t.co/sGt04LIS63
RT @ScienceChannel: The first written record of the law of friction was just found in da Vinci’s old notebook. bit.ly/2aniXLA https://t.co/sGt04LIS63