30 pages : color illustrations ; 29 cm
text txt rdacontent
still image sti rdacontent
unmediated n rdamedia
volume nc rdacarrier
Sloth and Sengi are friends. they have grown up together in the zoo, and know every bit of their enclosure. And, frankly, they are a little bored with it. So they begin to plan an escape, with the help of some simple machines ... This book introduces such simple machines as levers, gears, planes, and pulleys.