From BK WALLIS
Re ‘Green cups’ (In Brief, 21 May). It surprised me to find you implying
that using a ceramic mug 1006 times would be remarkable. As a teacher, I
use my work mug three times a day: I imagine other people have similar tea
or coffee requirements. I bought my present mug at the Assocation of Science
Education Annual Meeting in 1989. This means I have used it approximately
3060 times. Is that really unusual?
B. K. Wallis Little Marlow, Buckinghamshire
