Unexplainable or Not: Beach day!
Unexplainable
00:00
The Universal Theory of Sand
If it's small and more round, things aren't going to get caught on each other. But if they're like jagged and harsh, they could get caught in each other. The issue is when it gets even smaller, something like sugar or humidity can affect it. So knowing the individual grains isn't enough. It's about how they behave together.
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