The demon drink.

Apparently, scientists have found that, although too much booze can damage your brain cells, the brain is capable of repairing the damage, or at least some of it. For me, this is both good and bad news. The good news is that I don't need to worry so much about the amount I drink. The bad news is that I can no longer use it as an excuse for my mental vagaries - perhaps I really am getting senile!