Among all the choices offered by Starseed, lots of them needed a level 2 nucleus to be unlocked. If Jiang Liushi set up a laboratory to extract energy crystals, he would get many high-quality energy crystals. They would be better than those the military offered. Moreover, all other members of his team could enjoy the energy crystal.
Jiang Liushi intended to set up one laboratory as soon as possible and he was eager to acquire a special ability related to controlling energy. However, as an old saying goes, "To bite off more than you can chew." Jiang Liushi decided to give up on what he currently wanted and focus on training his brain.
Editor's corner; Did you miss Biology? I don't know about the theory's accuracy, but what I do know is that the self-transfusion is real. It's been banned as it's considered a doping method and its side-effects appear in the long run. D*mn, the PE lessons are useful :p So, please don't get any funny ideas because you read it in a novel, it's fiction. Have fun ^_^