This is a pretty neat way to explain how Alzheimers works by comparing it to neuronal networks. The memory is not gone, it just becomes harder to access.
22. Emergence and Complexity
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Also in this lecture there is a quite good explaination for why understanding the functionality of genes is so difficult: Genes can be fractal, so they do not just encode a single thing, but rather a recursive principle that can be used to construct the thing.
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"I will predict that within our lifetime there is going to be a revolution in some country at some point where nobody leaves their living rooms."