Simplicity is the mark of genius.  Grayson Rosenberger is changing the world with scissors, Scotch tape and a souped up hair dryer.  He’s found a way to make artificial legs look real for less.  A lot less.  Artificial leg covers can cost a thousand bucks.  Grayson’s cost $11.  He has invented a lightweight and more lifelike prosthetic leg using bubble wrap.