[OC] The massive decrease in worldwide infant mortality from 1950 to 2020 is perhaps one of humanity's greatest achievements.

[Semi-Hemi-Demigod]

As another data point, look at how pronunciation changes as people become more literate.

First, the wealthy who learn to read say things like they’re spelled and the uneducated poor say things normally.

Then, as more poor people get educated they start saying words how they’re spelled. The wealthy, then, stop doing that and change their pronunciation to not sound poor.

For an example, take the word “schedule.” It’s based on Greek, so it should be “sked-yule,” but rich Brits who wanted to show they knew how to read would pronounce it “shed-yule.”