The rat findings have been replicated many times and extended to creatures ranging from yeast to fruit flies, worms, fish, spiders, mice and hamsters.

• 大鼠的实验结果已经重复过许多次，而且，从酵母菌到果蝇、蠕虫、鱼、蜘蛛、小鼠及仓鼠，也都有同样的结果。