Why do billions of people still not have glasses?

It's thought 2.5 billion people could benefit from technology first developed in the 1200s.

from BBC News - World https://ift.tt/2QyNLMJ

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Two unvaccinated people die of measles in Pennsylvania

Cases in the US have hit the highest point since the virus was eliminated, as vaccination rates decline. from BBC News https://ift.tt/S2kt...