I learned how to horseback ride in English style, which is very hard, by the way. I had no idea how challenging it was. I've always ridden horses, but Western is like riding a horse in a rocking chair, as opposed to English, where you have to balance and hold on with your legs.
“There is no doubt that I, also, had long been aware of the problem, i.e. producing X-ray interferences, before the inherent difficulties had finally been surmounted.”