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Someone put up the foam brick pedestrian crossing concept in Pittsburgh. For people in the city, this is at Negley and Rippey.
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so just for reasons, all clay bricks are technically foam >.> "Essentially, bone-dry clay is full of teeny tiny pockets of air." and "Foams are materials formed by trapping pockets of gas in a liquid or solid."
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gonna let you slide with this one because it's a Cool Foam Fact