QUESTIONS

Q : Why do opera singers’ voices have to be so wobbly?

A. J. Bailey, Ipswich.

Q : The new dietary buzzword is ketosis. What is it? Is it good or bad?

Marjorie Ash, Tunbridge Wells, Kent.

Q : In the Nineties, there were reports of a black substance seeping from roads around Caracas, Venezuela. Was it ever identified?

E. Mason, Hull.