"Natural Penicillin For All" a sort of spiritual balm, one that moved the heart, rather than changed the mind

For reasons they couldn't really explain, and at a pace as slow and as unremittingly as the tide going out, the post WWII world fundamentally changed.

That world now repulsed the approach of those who long advocated "purifying" the gene pools down to just the "fit".

Instead it accepted that the world's very survival depended on the widest possible diversity of life: survival lay in expanding gene pools, not shrinking them.

I didn't say "the world's population changed their mind" because the world didn't : this was no intellectual or rationally thought out conversion, no decision made 'inside the brain'.

It was an emotional conversion, made 'inside the heart' and the language that best describes that sort of change is that used by the religious.