http://www.youtube.com/watch?v=ymCpnNyrmRY
http://www.newsobserver.com/2014/04/28/3818904/apex-inventor-entrepreneur-is.html
- …Steven Walther…has re-invented the toothbrush.
- …designed to be held by two fingers…
- …the gum lines and teeth enamel people could save by holding their brush with two fingers instead of a fist.
