Introductory clip about twin studies with Dr Nancy Segal:

https://www.bbc.co.uk/reel/video/p0bn70nw/nature-vs-nurture-how-your-genes-shape-who-you-are?fbclid=IwAR3pleuM5fBl4AjWqAs87IMjfE70E67gvWD2GKIB9u0iBNopgtd9TYwViGk#

https://www.bbc.co.uk/news/magazine-36228055