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
from BBC News - World https://ift.tt/2QyNLMJ
Why do billions of people still not have glasses?
![Why do billions of people still not have glasses?]()
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November 19, 2019
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