Mutation plus selection is how we are supposed to have evolved, but new research shows that mutations are making humans less intelligent and less able to relate emotionally, according to Stanford University's Gerald Crabtree.
In a recently published paper, he estimates that in the past 3,000 years, i.e. about 120 generations, every person has sustained two or more mutations harmful to intellect or emotional functioning. But not to worry: he suggests that in the future "we may be able to magically correct any mutation that has occurred in all cells of any organism at any developmental stage. Thus, the brutish process of natural selection will be unnecessary."
'Magic' may be the appropriate word to describe a process which can stop or even reverse the inexorable degradation of the entire genome (not just the genes related to brain function).
In reality, the entropy of the genome of all multi-celled organisms fits far better with a world that was created perfect then fell, than with a world that is getting 'better and better' through evolution.
(See Plant geneticist: 'Darwinian evolution is impossible', Time—no friend of evolution, and New DNA repair enzyme discovered.)?
Study suggests humans are slowly but surely losing intellectual and emotional abilities, medicalxpress.com, 12 November 2012.