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FIRST there was “How to boil the perfect egg”. Now comes “How to cut the perfect cheese sandwich”. Ig Nobel prizewinner Len Fisher of Bristol University in the UK has calculated how thick a slice of cheese should be to make the perfect cheese sandwich. Fisher, who won his Ig Nobel in 1999 for a report on the optimal way to dunk a biscuit, was commissioned by the British Cheese Board to work out how to maximise the cheesy aroma in a sandwich. He discovered that in a sandwich made of pre-sliced white bread lightly spread with margarine, the optimum thickness for a slice of cheddar is 2.8 millimetres.…