Another year he tested milk to see if fat content affected how fast it would go bad in a cool, dark environment (under the bathroom cabinet).

EW! How badly did your house begin to smell? Last year, my sister bought bottled milk that went bad too early and she was supposed to take it back for a refund, but didn't because she had to work and would forget. That milk sat in our refrigerator so long, the cream and whey started to separate, and then it simply decomposed altogether. And, of course, because it was in a glass bottle, we could see every stage! There's a science fair project for you!