Darwin’s not sure whether this advice is for ‘coffee drinkers’ or for ‘ski jumpers’. He thinks it probably cuts the old genome both ways. Darwin recommends that one’s genomes will be most happy if one has his morning coffee prior to ski jumping. This finishing the morning coffee, though, still has him perplexed.
Natural selection deems that some individuals serve as a warning to others. Who are we to disagree? The next generation, ever and anon, is descended from the survivors