Straightening Warped Plywood

I cut plywood into 16-inch by 48-inch pieces and a few of the pieces warped significantly. Is there a way to get the pieces to straighten out?

Richard Jones:┬áNone that I know of, apart from fixing it down to a stout flat frame or base. It is sometimes said that “flat” and “plywood” are two words that don’t belong in the same sentence. If you are making boxes out of the warped pieces, it is often the case that good joinery such as a tongue and groove or biscuits will hold or pull the parts flat enough. It rather depends on how critical flatness and square is to the completed box.

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