If you want to convey something's size, try a familiar comparison. There was a story about a hapless biology teacher who had reached the birds and bees lesson. Faced with a class of pubescent girls and needing to tell them how big the testicles were, she ventured that they were about the size of a peewit's egg. ‘Well, now we know how big peewits' eggs are,’ came a stage whisper from the back. Doctors usually go for fruit. Tumours are the size of almonds, grapes, tangerines, oranges or …