Abstract
Heraclitus, the Greek, pre-Socratic philosopher (figure 1), believed the world was ultimately made of fire, a metaphor for change. He wrote five centuries BC: panta rhei (Πάντα ῥεῖ, “everything flows”), exemplifying it with his quote: “No man ever steps in the same river twice.” No long COVID patient ever steps in the same river twice, as their condition changes continuously due to its natural history, or because of treatment http://bit.ly/3QMFhyK
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