Once a kid is born, their genetic fate is pretty much sealed. Or is it? This hour, we put nature and nurture on a collision course and discover how outside forces can find a way inside us, shaping not just our hearts and minds, but the basic biological blueprint that we pass on to future generations.
Jad starts us off with some wishful parental thinking: that no matter how many billions of lines of genetic code, or how many millions of years of evolution came before you, your struggles, your efforts, matter -- not just in a touchy feely kind of way, but in ways that can mold your kids on the deepest level.
Lars Olov Bygren, a professor at Umeå University in Sweden, grew up in a remote village north of the Arctic Circle.