One way to increase serotonin is to increase insulin levels thus eating a bag of chocolate chip cookies can do the trick. And, remarkably, as one ages from childhood to adolescence to adulthood, the importance of heritability of IQ increases!

He has clearly spent a great deal of time familiarizing himself with the subject, and it shows; nevertheless, he is no expert. Spelled out in a billion three-letter words using the four-letter alphabet of DNA, the genome has been edited, abridged, altered and added to as it has been handed down, generation to generation, over more than three billion years.The book covers everything on genetics from their history to determination of sexuality, giving a summary of the huge subject of genetics.

For further findings on my maternal side, I have also relied on “Five Years in South Mississippi” by Theophilus Shuck Powell, which I have reviewed on Goodreads. I appreciate that it's trying to be generalist, but it's generalist to the point of failing to convey ideas. He also puts a lot of the fears of genetic tinkering to rest by showing just how the data is being used. Eugenics a century ago, based on faulty knowledge of genetics, led to immoral actions by governments and the US Supreme Court, pushing through compulsory sterilization of people such as those with trisomy 21 which causes Down syndrome.Also, I learned how genes can be expressed due to the release of cortisol and other hormones during periods of stress. Each chapter discusses a topic in an entertaining way and somehow makes some of the hardest subjects seem simple.