Are we products of nature or nurture? Science answers age-old question

Twin studies collated over the past 50 years reveal human traits and disease are almost equally determined by genetic and environmental factors

The age-old question of whether human traits are determined by nature or nurture has been answered, a team of researchers say. Their conclusion? It's a draw.

By collating almost every twin study across the world from the past 50 years, researchers determined that the average variation for human traits and disease is 49% due to genetic factors and 51% due to environmental factors.