Twin Studies Help Us Separate Nature from Nurture (opens in new tab)

However, throughout the 20th century, scientists have been able to study the phenomena of twins raised separately, which opened a new door to answering the question of nature vs. nurture. From these studies, it turns out that genetics has more say in some factors, while environment is more important for other facets of life. This video from AsapSCIENCE shares some of the findings of those studies, but it doesn't address the disturbing scenario that made them possible. Why have there been so m...