<p>Essential rope-and-string tying advice for the nerdily inclined. Includes two lengths of rope to help you practice tying knots. Attention all nerds, put down that laptop and pick up this brilliant guide to tying 50 must-know knots. If you're unaware of the difference between a Cow Hitch and a Marlinspike Hoop or a Running Bowline and a Square Lashing, all will be revealed in "50 Knots You Need to Know." Packed with step-by-step instructions, d...