208. The brain needs mainly earth magnetic field to grow
Muscles grow needs blood flow and blood flow needs Qi energy circulating in a body. Without Qi the body strength declined rapidly. - Simon Kong https://science.nasa.gov/science-news/science-at-nasa/2014/10apr_twins A big difference of the twins DNA just after one year as one of them stayed in the space station, the other used as a controlled on earth. You can see from the picture, ageing begins from the one who ventured into space (Scott on the right of picture @ video time 1.02). Archeology finding revealed that the first human found in south west China, Yunnan province, who used hands to create fire in 1.7 millions years ago (above picture). Along an evolution cycle, earth magnetic field helps the human brain to develop fully until human can use language to communicate effectively; ie listening, speaking, writing and reading, that development was amazing. Many species couldn't make it to nowadays world, they were eliminated long ago, like dinosaurs, golden Toad,Zanziba