O.K., O.K., I know. This may be a bit of a stretch, I’m no expert and nobody asked me. But . . .

If ingesting many thousands of units of vitamin D weren’t helpful to our health, why does the human body expend the energy to manufacture 20,000 units from only 20 minutes in the summer sun? And why did our skin expend the energy to turn white as we moved from Africa to more northern lattitudes?

Rodger Malcolm Mitchell