On Edge.org, scientists disuss a main belief that has changed for them.

4
We are all equal

Simon Baron-Cohen, psychologist, Autism Research Center, Cambridge University When I was young I believed in equality as a guiding principle in life. My mind has been changed. I still believe in some aspects of the idea of equality, but I can no longer accept the whole package. Striving to give people equality of social opportunity is still a value system worth defending, but we have to accept that equality has no place in the realm of biology.

 

6
Men are at the top because they are smarter

Helena Cronin, philosopher, London School of Economics

I used to think that these patterns of sex differences resulted mainly from average differences between men and women in innate talents, tastes and temperaments. After all, in talents men are on average more mathematical, more technically minded, women more verbal; in tastes, men are more interested in things, women in people; in temperaments, men are more competitive, risk-taking, single-minded, status-conscious, women far less so. But I have now changed my mind. It is not a matter of averages, but of extremes. Females are much of a muchness, clustering round the mean. But, among males, the variance—the difference between the most and the least, the best and the worst—can be vast. So males are almost bound to be over-represented both at the bottom and at the top. I think of this as ‘more dumbbells but more Nobels’.

 

10
Races do not exist

Mark Pagel, evolutionary biologist, Reading University

There is an overbearing censorship to the way we are allowed to think and talk about the diversity of people on Earth. Officially we are all the same: there are no races. Flawed as the old ideas about race are, modern genomic studies reveal a surprising, compelling and different picture of human genetic diversity. What this all means is that, like it or not, there may be many genetic differences among human populations—including differences that may even correspond to old categories of ‘race’—that are real differences in the sense of making one group better than another at responding to some particular environmental problem. This in no way says one group is in general ‘superior’ to another, or that one group should be preferred over another. But it warns us that we must be prepared to discuss genetic differences among human populations.