In the past 15 years, some blood exchange experiments have been carried out with young and old mice. There are some startup companies here in Silicon Valley that are pretty excited about this. I don't really know how they would actually be able to try a blood transfusion like that. But there are stories of people making models of birds wings or kites in order to fly. And you know if you think about Daedalus and his son Icarus. They both did succeed in flying but at a very high cost.

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