Why is the bottom of a plastic bottle never flat?
most of the current plastic bottles, especially the soft drink bottles, have the bottom of the bottle designed bumpy, with 5 protrusions in the form of folds, never as flat as
Tags : plastic bottles
Light bulbs all day without electricity from discarded plastic bottles
homemade electric light bulbs from plastic bottles help bring light to thousands of poor households living in homes with no light or electricity in the world.