1) What are black when you buy them, red when you use them and grey when you throw them away?
2) On which day of the year do fewest people die?
3) In which book does the Index precede the Introduction?
If you have not tried to solve them, have a go now. For everyone else the answers are after the break.
2) 29th February
3) A dictionary.
Did you solve them? Any other answers?