“It is said that science has presented humans with three hammer blows to its sense of self-importance. Copernicus taught us that the Earth was not at the centre of the universe; Freud showed us that our instincts are emotional and sexual rather than rational and godly; and Darwin demonstrated that we were descended not from angels but from apes. To this we might add the gene-centred view of life which shows that in many cases we are not the final beneficiaries of our own behaviour; the buck stops not with us but our genes.”