Test two hundred mice of the same type without leukemia, and let them receive the same dose and the same intensity of a certain kind of radiation, and then half of the mice will not be restricted to eat the food they usually eat, and the other Half provided them with the same food, but the amount was limited. It was found that 55 mice in the former group had leukemia and only 3 mice in the latter group had leukemia. From this we know:. ['Whether or not they are exposed to a certain type of radiation, letting mice eat the food they normally eat increases the likelihood of developing leukemia.', 'Leukemia is not related to any kind of radiation in any kind of mouse.', 'By controlling the amount of food these mice have, they can reduce their chance of developing leukemia from exposure to certain rays.', 'All rats exposed to some kind of radiation will eventually develop leukemia.']