The only genetic changes in humans we ever hear about are those producing diseases such as cystic fibrosis. Has anyone identified any genetic changes within recent generations that make individuals possessing them 鈥渕ore fit鈥� to thrive in today鈥檚 environment? Would we even know these changes if we saw them? And would we consider them normal for healthy humans?
Colin Bamforth, Altrincham, Cheshire, UK
We pay 拢25 for every answer published in New Scientist. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.
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This article appeared in print under the headline 鈥淪elected selections鈥�