Rubber Bands

What are they making the "rubber" bands out of nowadays. They don't seem to last too long. I'm constantly replacing them. Every now and then,
when going through old storage boxes, I find items with rubber bands around them that seem just as fresh as when new.
I have new rubber bands that I have just lying around. They seem to disintegrate almost at will. What gives anyway?
Al
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I second that question. -- Boris
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