Hart-Davis, Adam <br/><br/>
Inventions. a history of key inventions that changed the world 

 - UKI  Walker Books Ltd  2012 
 - 12 
<br/><br/> If you've ever wondered why the pencil came into existence, or how a steam engine works, or when we started using flushing toilets, this book has all the answers. Based on seven key areas of invention, Adam Hart-Davis tells the stories behind steam power, lighting, toilets, clocks, communication, bikes and flight. 
<br/><br/><label>ISBN: </label>9781406315004 
<br/><br/><label>Dewey Class. No.: </label>500  / HAR-I