Children can build eight simple machines that can be combined to set off a chain reaction. They can use all the included Lego pieces in conjunction with their own collection to build the contraptions and record all their experiments in the pages of the book. 

This book contains instructions and inspiration for creating Lego chain reactions. Includes thirty-three Lego elements, six Lego balls, 2.2 yards of string, eight paper ramps, two paper pop-up signs, one paper funnel, one paper flag, one paper bucket and one platform. 

Author: Pat Murphy. Spiralbound; 48 pages. Published Year: 2014. ISBN 978-0-545-70330-7.