What are the cracks in the sidewalks *really* there for?
by 
Ace of Hearts
ANSWERS: 7
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Expansion and contraction in hot and cold weather. I know this because this is part of my husband's profession.
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To break you mother's back, of course.
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It's something for the Liquid-Morphing-Mole-Men to seep through. How else are they supposed to get to the surface to eat small birds? Seriously: So they don't get as cracked in the hot/cold weather. Certain temperatures expand and contract the cement.
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Yeah, if you lay concrete in big slabs without sectioning it off into segments, it cracks as it expands and contracts. E.g. My front path.
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They just made it there.
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To drive people with OCD even nuttier. "As Good As It Gets"
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Basic principles of science. Matter expands when heated right. When the pavement gets hot, it will expand. The cracks are there to create a small space in between each slab for the slabs to expand. If there is no space, the slabs of concrete that make up the sidewalk would buckle.
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