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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. November 19, 2019 at 04:55PM https://ift.tt/eA8V8J BBC News - World

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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