TY  - BOOK
AU  - Hart-Davis, Adam
TI  - Inventions. a history of key inventions that changed the world
SN  - 9781406315004
U1  - 500 
PY  - 2012///
CY  - UKI
PB  - Walker Books Ltd
N2  - 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
ER  -