1. In 2000, the 'impossible' Eternity puzzle was solved by an unemployed mathematician - he won the £1 million prize and the inventor had to sell his home to pay it. :eek:
2. A litre of vinegar is heavier in winter than in summer. :cool:
3. A snail's teeth are arranged in rows along its tongue like the edge of a saw. When it eats the snail cuts through its food using this serrated tongue. :p

