By early 2000, it seemed clear to Bygren that the feast and famine years in 19th century Norrbotten had caused some form of epigenetic change in the population.
很显然，19世纪北搏腾丰年和歉年导致了该地区人口外基因改变，这点早在2000年初本内已经很清楚。
2
So he drew a random sample of 99 individuals born in the Overkalix parish of Norrbotten in 1905 and used historical records to trace their parents and grandparents back to birth.