[aab0]

> Of course, it's hard to separate out or even infer the causes as nature vs. nurture (which the article is careful about) but the part about twins was the most striking for me:

If you look, they already give you enough to get an idea of the relative contributions:

> 15% of siblings share an occupation, which is higher than the 8.6% rate for any two same-gender, same-age individuals in the population. Twins' tendency to choose the same occupation, at 24.7%, is even more striking.

So siblings have twice the rate of random people, and identical twins have twice the rate of siblings. Since twins have twice the genetics as well, this points to high heritability and (probably) lower shared environment.