From NICK BEARD
At university there was usually one person who thought it was fun to
shake a beer can vigorously and replace it in the refrigerator. I was reminded
of this problem when my son (under 2 years old) did the same. Unfortunately,
there were two similar cans of beer. Can any of your readers think of a
way of telling the shaken from the unstirred?
Nick Beard London SW17
