Friedhoffer, Robert. <br/><br/>
Toying around with science :   the physics behind toys and gags / 
by Bob Friedhoffer ; illustrated by Linda Eisenberg. 
 - New York :  Franklin Watts,  1995. 
 - 95 p. :  ill. ;   24 cm. 
<br/><br/><label>ISBN: </label>0531112152