Plastic containers - are they really discouraging for you? i have hear from my family that using and microwaving surrounded...

i have hear from my family that using and microwaving surrounded by plastic containers is a bad entry - that only cup should be used. something to do with the plastic breaking down. anyone know how true this is?
Fruit flies?
Answers:    From what I read surrounded by an email once, when certain plastics are heated, the condensation that drops on the food contains DIOXIN. I estimate I'll call the 800 number on the Gladware box and see what they enunciate.
What is the best scent to repel house...