In a series of letters to her grandfather, DC explores a few mysteries of the Health Universe. Such exploration yields big insights about human wellbeing: 1. One exceptional biorhythm dictates human health. 2. Our emotions and memories are key parts of self-protection. 3. There is no such thing as a benign breakdown; warning signs show up in at least 3 places. 4. The autonomic nervous system (ANS) governs health and wellbeing. 5. Chronic distress lies at the root of chronic illness. 6. Long covid, chronic fatigue syndrome and cancer express on the same self-protection spectrum. 7. We don't die of old age.