Sorry but I feel like being a dork.
Dioxin is found in almost every plastic in a compound called PCB, Polychlorinate Bi-something. It's pretty toxic, if you were exposed to 600 nanograms (thats only 0.000000006 grams) of dioxin their is a 50% chance it will kill you. When you freeze or heat a plastic their is a chance that dioxin is being release from the plastic in the process...
-Bill Nye...
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