· ruler videos

Hard to Believe Box!

  

added 2008 Tue Apr 15 7:00:09
Unreal! You have to see this to believe it. How to make it with household materials.

Unbelievable Ruler

  

added 2007 Thu Dec 13 15:10:10
You won't believable your eye until you see it. Amazing way to balance a ruler like this, as easy as ABC, you can do it too.