Book Title: Lance Dragon Defends His Castle with Simple Machines
Author: Mark Weakland
Format: Paperback | 24 pages
Publication Date: 15 Nov 2012
Hey, dudes! Skateboarding is my thing, but when barbarians invade my castle, I have to defend myself. Watch me launch a water balloon with a lever and lower a key with a pulley. Roll with me and find out how simple machines simply rock!