Imagine it’s the late 19th century. You’re a famous Norwegian Arctic explorer, and you want to be the first person to make it to the North Pole. Fridtjof Nansen was in just this position when he proposed his second voyage; freezing a ship in the sea-ice to spend three years slowly drifting across the pole. It’s an interesting tale, but I’ll leave it to others to tell.
His relevance to this post comes from his observation that icebergs don’t drift downwind; rather they move at an angle to the wind. Nansen presented this riddle to Vagn Walfrid Ekman, who in turn presented his answer to the world in 1905.