TY  - BOOK
AU  - Hart-Davis, Adam
AU  - Choksi, Nishant
TI  - Inventions: a history of key inventions that changed the world
SN  - 9781406315004
U1  - R 629.23 HAR-I 
PY  - 2012///
CY  - London
PB  - Walker
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, it tells the stories behind steam power, lighting, toilets, clocks, communication, bikes and flight, and how they are relevant to our world today
ER  -