The Baffle: Plastic Bottles

Once in a while will be posting “The Baffle,” dealing with some of life’s most puzzling questions. Today, the bottoms of  bottles — soda, water, and the like. Why aren’t they flat?  What’s with the ridges that make them (big ones especially) tumble over all the time? It didn’t use to be this way. There must be an explanation, but can’t seem to find it.

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