toothbrush...

I think many people will find these interesting. Is is funny that you can use something every day but you don't know much about it.
Let's say, for example how it's made...watch this

or

How easy is to buy it...



also you can use it for different kind of things, to improve...



but be very careful when you use it, especially for it's mainly scope: http://www.wildsound-filmmaking-feedback-events.com/the_pothole.html    (middle of the page-seinfeld)

Some useful advice(from a nice lady) you will find below

If you aren't decided or you are energetic or a bit lazy, maybe this will help you

or you can do like this:))