Soviet scientists performed the strangest experiments.
They decapitated dogs and kept their head alive by maintaining blood circulation in the severed head artifically:
According to Wikipedia the experiments were real even if the results were a bit exaggerated.
For example, the Soviets said the severed dog heads lived for hours while the truth is probably closer to minutes.
Nevertheless, no matter how cruel and barbaric these experiments are they were invaluable for the Soviets to develop open-heart surgery methods.
Is animal suffering the inevitable price for human health?