I have often noticed that my fillings feel a bit strange when I鈥檓 bouncing on a trampoline. Several other people I know also report this. Oddly, it doesn鈥檛 happen on the landing, when I am experiencing greatest deceleration, but on the apex of a bounce, at the point when I am momentarily weightless or just beginning to fall. What causes this? Does anybody know if jumping astronauts notice any filling-based irritation while horsing around in zero gravity?
Jasper Fforde, Hay-on-Wye, Powys, UK