tether

Kurzgesagt explains the skyhook, a rotating cable with a counterweight that could catapult spacecraft from Earth orbit toward deep space. It covers why it would make space travel cheaper and more efficient.

Jake Thackray performs the folk song Molly Metcalfe, which opens with an explanation of the traditional northern English sheep-counting system (yan, tan, tethera). It is a short, witty piece of British folk songwriting.