![It's a piece of thin cardboard, but I don't understand why it's inside this Kenmore 790.80333310 microwave oven. Any guesses what function it serves? : r/whatisthisthing It's a piece of thin cardboard, but I don't understand why it's inside this Kenmore 790.80333310 microwave oven. Any guesses what function it serves? : r/whatisthisthing](https://i.redd.it/pygkzngisut01.jpg)
It's a piece of thin cardboard, but I don't understand why it's inside this Kenmore 790.80333310 microwave oven. Any guesses what function it serves? : r/whatisthisthing
![Can a microwave oven heat a paper box? Does it hurt the human body?_Disposable paper cups custom _ disposable paper bowl manufacturers _ disposable paper barrel manufacturers - Zhejiang Yisheng Paper & Can a microwave oven heat a paper box? Does it hurt the human body?_Disposable paper cups custom _ disposable paper bowl manufacturers _ disposable paper barrel manufacturers - Zhejiang Yisheng Paper &](http://www.ys-package.com/en/data/upload/image/20180813/1534147709357533.jpg)
Can a microwave oven heat a paper box? Does it hurt the human body?_Disposable paper cups custom _ disposable paper bowl manufacturers _ disposable paper barrel manufacturers - Zhejiang Yisheng Paper &
![I put my coffee cup in the microwave and it scorched right on the 'Do Not Microwave' warning. : r/mildlyinteresting I put my coffee cup in the microwave and it scorched right on the 'Do Not Microwave' warning. : r/mildlyinteresting](https://i.redd.it/t2wy30qpkihz.jpg)