Was cleaning a stain and it occurred to me it should be evenly spread, however the edge is thicker and harder to clean than the center of the stain.
In: Biology
At the risk of being completely wrong, I’m going to just add a theory. Maybe when it lands, the ripple effect pushes more of it to the edges, like a tiny wave. And because blood is thicker than water (awesome), not as much redistributes itself to even out?
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