This weekend, American skater Mirai Nagasu made Olympic history when she became the third woman ever to land a triple axel in an Olympic competition. To understand how hard this is, Holly Yan of CNN explains, that though "the axel jump was first invented in 1882... it took more than 90 years for the first man to land a triple Axel. And it wasn't until 1991 that the first American woman landed a triple Axel."
So basically, Nagasu did the impossible.
In celebration of Nagasu's stunning and rare feat, here are seven of the rarest Olympic feats ever.