Let’s say you spill some tomato soup on your counter. It dries. You go to wipe it away after it dries, and the center wipes away easily, but the edges stick and need additional scrubbing to get out. I’ve seen it with other hardened liquids, too.
Why?
In: 993
Basically, spills aren’t flat
If you look closely, they kinda thin up at the edges, and have a peak near the middle
Since it has to dry from the outside inward, the rings dry up firmly before the centre has even started
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