ÐÓ°ÉÔ­´´

Questions and answers should be kept as concise as possible; we reserve the right to edit items for clarity and style. Please include a daytime telephone number and a fax number if you have one. Questions should be restricted to scientific queries about everyday phenomena. The writers of all answers that are published will receive a £l0 book token. IPC Magazines Ltd reserves all rights to use question and answer material submitted by readers. Send questions and answers to The Last Word, New ÐÓ°ÉÔ­´´, King’s Reach Tower, Stamford Street, London SE1 9LS (fax 0171 261 6464) or by e-mail to newsc1@stirling.ac.uk (all correspondents must include their postal address).