One property of the lemniscate of Bernoulli is that a ball rolling down an arc of the lemniscate under the influence of gravity, will take the same time to traverse it as a ball rolling down a straight line segment connecting the endpoints of the arc https://t.co/hbcXKfC06Z pic.twitter.com/yyI1j3XGre
— Massimo (@Rainmaker1973) August 29, 2019