How do we learn complex tasks like playing the piano? Why can we remember things better after a good night's sleep? And why do people - and fruit flies - drink again after the hangover from hell? The answers are all in your genes. Plus, why large-scale searches for so-called "genes for schizophrenia" and other psychiatric diseases are turning out to be trickier than we thought, and a gene of the month with a touch of Scottish - or maybe Hollywood - spirit.