Fresh from the clogged tubes of teh intarwubs…
"In Feig's study, mice genetically engineered to have memory problems were raised in an enriched environment–given toys, exercise, and social interaction–for two weeks during adolescence. The animals' memory improved–an unsurprising finding, given that enrichment has been previously shown to boost brain function. The mice were then returned to normal conditions, where they grew up and had offspring. This next generation of mice also had better memory, despite having the genetic defect and never having been exposed to the enriched environment."
"While these experiments suggest that our snap judgements of faces really do contain a kernel of truth about the personality of their owner, Little stresses that the link is far from clear-cut. He and Perrett only found a correlation at the extremes of personality, and other studies looking for links with different aspects of personality have failed to find any association at all. The owner of an "honest" face, for example, is no more likely to be trustworthy than anyone else."