Physicists Physicists do it on the event horizon. Physicists do it in waves. Physicists do it with ropes and pulleys. Physicists do it with vectors. Physicists do it at the right moments.
Physicists do it with force.
Physicists do it on the spur of the moment. Probabilists Probabilists do it on random walks. Probabilists do it stochastically. Pure mathematicians do it rigorously. Quantum physicists Quantum physicists can either know how fast they do it, or where they do it, but not both.