30 Common Internet Lifehacks Tested

What is a "lifehack?"  Basically, it's a way to do something in life that isn't conventional or the obvious way to do it.  It's the opposite of functional fixedness, which is a cognitive bias that an object can only be used in the way it is normally used.  There are numerous websites dedicated to lifehacking, the biggest of which is called, naturally, Lifehacker.  Most of the time this stuff is just amusing, but sometimes it's genuinely useful.  As I watch these things, I often wonder if it actually works.  Well, MentalFloss has come to my rescue, testing out 30 of the most commonly repeated Internet lifehacks.  Watch, learn, and enjoy...and be surprised: