I am just going on what we saw one night on one of the network news shows (Dateline NBC or something), they said that you should never re-use any plastics with a number 1,6 or 7...
Tupperware is also #7. Do you throw those out after each use?
It's all hype people. Until there's real science, don't trust the media!
There is some science behind some of the risks of using plastic. Wikipedia references a couple:
http://en.wikipedia.org/wiki/Plastics#Negative_health_effects
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