Simmer haddock, potatoes, milk, onion and parsley to make this comforting soup. Serve with crusty bread for a filling lunch or supper

Programs that facilitate ab initio calculations can relegate the underlying SCF procedure (usually coupled with contracted Gaussian atomic orbital basis sets) to a ‘black box.’ This paper attempts to rectify this situation with a spreadsheet that contains all the essential elements of far more complicated ab initio calculations, but on the simplest possible molecular system.