You know, take a rubber substitute... randomly match it with a kid's toy... and, bingo, you got a million-dollar invention called Silly Putty.
It's gooey like rubber. It bounces and it stretches. Play with it, or use it to take dog hair off the furniture. It's Silly Putty.
Why buy Silly Putty, Chia Pets or sidewalk chalk when you can make your own toys for less than $1—and recycle a few toilet paper tubes, nylons and plastic bottles in the process?
The "egg" sandwich at Subway, for example, has ingredients like glycerin, which is found in soap, and dimethylpolysiloxane, a type of silicone found in Silly Putty and many lubricants.
