Grounds

As a coffee drinker, I like to discover that there's something good about drinking it (put "coffee" in the search bar to see those things). But I never saw this coming - the grounds may be economically valuable.

Charred coffee grounds, when added to concrete, make it 30% stronger, according to researchers in Australia.

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Usually they're left in landfills to emit greenhouse gases. Using them in concrete will ease the global demand on sand for construction. If this discovery is used, it will benefit the environment. 

A previously (nearly) useless substance now valuable? That demonstrates the tremendous economic value of innovation. Knowledge/ideas/imagination create wealth.

from Science Alert