Before the industrial and hygienic revolution, a woman gave birth to up to eight children. She started from an age like 16 years to up to 35 years. This high birth rate did not result in a significant population increase though. It took 2000 years to double the population. This implies that most babies and toddlers died before reaching puberty. Thus giving a significant evolutionary pressure to favour those who would not die from child deceases, poor hygiene and low quality food. Mathematically this implies that every 25 years a new generation evolved slightly better adapted to some specific traits making the chance of surviving young age greater. In hundred years, we have thus four generations, leading to 32 attempts resulting in eight lives. In 2000 years, the numbers become more impressive: 640 attempts leading to 160 adult lives. From the Roman era to now, you had 640 relatives out of which only 160 made it to you. The ancestry is however even vaguer. Here binary multiplicati...