olympic athlete. that is to say there us a particular marker that 30% of all of us have and when you look, though, at olympic sprinters, 50% of olympic sprinters have it. that means that half of olympics do not have it. so it's not very complete. and we know that there are many other factors involved in whether you will be a good athlete. your psychological state, your drive, how interested you are this the sport, your nutrition. and the problems are that there are also be a lot of pressure on kids one way or the other. so little johnny may be interested and the parents say, no, you don't have the gene. some of these companies are testing for gene has associated with heart disease and alzheimer's disease. so we face the prospect of companies telling the johnny at