A herd of buffalo can move only as fast as the slowest buffalo.

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
killing 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.