And I mean everything. Currently, a debate rages about vaccination. But why? The “settled science”, since almost forever (at least since vaccination was discovered), has been one of the 20th century’s most dramatic public health achievements.
It eradicated smallpox.
In the developed world, it has made polio a far distant memory. In the developing world, the disease is making a comeback.
Back when I was a kid, measles happened occasionally. Then it all but disappeared. But now, in 2015, it is making a very strong comeback.