A herd of buffalo can move only as fast as the slowest buffalo. (So I am told by a princess from Alberta. How she knows this I didn't ask.)
When the herd is hunted, it is the slowest and weakest ones at the back that are killed first. This natural selection is good for the herd as a whole, because the general speed and health of the whole group keeps improving by the regular culling of the weakest members.
In much the same way, the human brain can only operate as fast as the slowest brain cells.
Excessive intake of alcohol we all know, kills brain cells, but naturally it attacks the slowest and weakest brain cells first. In this way, regular consumption of beer eliminates the weaker brain cells, making the brain a faster and more efficient machine.
That's why you always feel smarter after a few beers.
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