Washboard abs, stain-free carpets, and the ability to dice a tomato with a playing card: Do these promises sound familiar? These are just a few of the claims made by some of the world’s most ...

We may receive a commission on purchases made from links. If you're a boomer, Gen Xer, or millennial, there's a good chance you're old enough to remember waking up in the early hours of the morning to ...