I calculate that the electrons in radiation therapy hit you at 99.8% of the speed of light, and the beam used in a 90-second gamma ray therapy session could, if fired with less precision, kill a horse (they did not let me test this).
Special 10th anniversary edition of WHAT IF?—revised and annotated with brand-new illustrations and answers to important questions you never thought to ask—coming from November 2024. Preorder here!
