In 1969 he created a new curved ice ax, the Piolet, which gave climbers better purchase, say, on the smooth surface of a frozen waterfall.

FORBES: The World According to Yvon

The Trotsky ice ax, now on display at the exhibit in New York, was acquired through a vigorous negotiation process that stretched on for three years and concluded on a bridge crossing between the U.S. and Mexico.

FORBES: Mansion Of Secrets: An Espionage Expert's Outrageous Spy Lair

He recently used an ax to cut through the ice in the pond next to the sauna, making a hole so that "saunalised" competitors could jump into the icy water after their time in the hot room, to win extra points.

WSJ: In Estonia, a 'Scavenger Hunt' for People Who Love Saunas