Physicists do it a quantum at a time. Physicists do it at two places in the universe at one time. Physicists do it attractively. Physicists do it energetically. Physicists do it in black holes.
Physicists do it in waves.
Physicists do it like Einstein. Physicists do it magnetically. Physicists do it on accelerated frames. Physicists do it particularly. Physicists do it repulsively.