#physic *On the moon, where there is no air to slow things down, the astronaut David R. Scott performed the feather and lead weight experiment and found that indeed they did hit the ground at the same time.* ~[[Hawking]] *G. Zendri, L. M. Gratton, & S. Oss, The weight of iron and feathers. Physics Education, vol. 49, no. 5, 2014, pp. 544-547 J. B. Wagman, C. Zimmerman, & C. Sorric, “Which Feels Heavier—A Pound of Lead or a Pound of Feathers?” A Potential Perceptual Basis of a Cognitive Riddle. Perception, vol. 36, no. 11, 2007, pp. 1709-1711*