From Eric Kvaalen, Les Essarts-le-Roi, France
I don’t understand why there is so much worry about weightlessness during space travel. Getting to the moon takes just a few days, and for longer trips there is a solution. Tie two space capsules together with a tether 2 kilometres long and set the whole turning, like a gaucho’s bolas, at a rate of one revolution per minute. This way, each capsule experiences 1 g of artificial gravity (8 July, p 21).
