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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200 Palestinian prisoners released to jubilant scenes in West Bank

The prisoners were released in exchange for four female hostages held by Hamas in Gaza. from BBC News https://ift.tt/oGWwnSP