How would you know? - for all the 30 days you have been listed? Knots are pretty interesting. Why? Well skills for one. Get stuck, practice a new skill - one knot per session. Knots are also pretty useful if you get stuck outside ~ http://www.flickr.com/photos/bootload/sets/72157623445003205... hiking ~ http://paulgraham.com/addiction.html

Knots are also pretty interesting maths wise ~ http://en.wikipedia.org/wiki/Knot_(mathematics)