LateralRiddle #1402
On a brand-new sidewalk, the workers carefully cut a straight groove across it every few feet, on purpose, before anyone had ever walked on it. Why?
Hint: They expected something to happen and planned for it.
Answer
So the concrete cracks neatly along the grooves
Concrete always cracks as it shrinks and moves; the grooves are weak spots that make the cracks form in straight, hidden lines.
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