“People associate science with absolutes that are immutable, when in fact science is a process that continually uncovers new information. As new information evolves, the process of science allows for self-correction. The biological or health sciences are different from the physical sciences and mathematics. With mathematics, two plus two equals four today, and two plus two will equal four a thousand years from now. Not so with the biological sciences, where what we know continues to evolve and uncertainty is common. This uncertainty is magnified in the context of a deadly pandemic when there is already anxiety and suffering. With COVID, our understanding of transmissibility, severity, vulnerability of different people, and level of protection, to name a few, continually evolved, and our medical advice had to change to reflect this. This is exactly what happened in early March with the question of whether to wear masks and how effective they were.” ScienceChangeMathematicsComplexity Book:On Call: A Doctor's Journey in Public Service Source: On Call: A Doctor's Journey in Public Service