There are 50 trillion cells in your body and each cell’s receptor is vigilant to danger. When you feel stressed you release cortisol and adrenaline, signalling to the receptors to protect the cellular operating function. When you feel calm you release serotonin and oxytocin, signalling to the receptors that it’s safe for cells to transition from a survival mode to growth mode. I created The Big Apple Experiment as a powerful metaphor to demonstrate the impact of emotions on the immune system and mindset.