Jan 28, 2015

Q.1581

Image: Bill Gates

In this photo published in Jan 2015, Bill Gates is seen drinking water made by "Omniprocessor", a machine that recycles it from a very unusual source material. This is part of his foundation's work to 'reinvent' a part of most households.

What is this material?

[+ Show Answer]

This day last year: Q.1216

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