Will putting your onion in the freezer keep you from crying as you cut it? Maybe, but if you leave it in there too long, you’ll have trouble cutting it at all, and you better know exactly how many onions you’ll need. On this week’s mental_floss List Show, John Green tests more tips from the internet that may or may not be of any use. The best part is seeing Green turn red as he tries to tear an apple in two with his bare hands. I have to object to his whipped cream asessment. This will work, but ten quick shakes are not sufficient to do the job. This is the fourth of a series. You’ll find more “life hacks” (or tips) debunked in part one, part two, and part three.