多巴胺-奖赏激素 Dopamine-The Reward Chemical: make you happy and boost your memory. do thing you enjoy; try new things; accomplish little easy task（先甜后苦, easy to be addicted to）
内啡肽-天然止痛药Endorphins-The Painkiller: help destress. exercise; overcome challenges; smile; Yoga（先苦后甜, rewarding comes from hard work, could be addicted to, workaholic ）
血清素-情绪稳定剂 Serotonin-The Mood Stabilizers: good for you sleep and memory. sleep early; eat healthy; meditation; write dairy; sunbathing. Sunbathing in morning and omega-3, chocolate etc.
催产素-亲密荷尔蒙Oxytocin- The Love Hormone: boost trust. massage; hug; socializing; appreciate others. it’s where trust from.