000			00784nam a2200169Ia 4500
020			_a9781406315004
040			_cPKLaCSN
082			_aR 629.23 HAR-I _bHAR-I
100			_aHart-Davis, Adam
245		0	_aInventions: a history of key inventions that changed the world
260			_c2012 _bWalker _aLondon
520			_aIf 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
700			_aChoksi, Nishant
942			_cR
999			_c848146 _d848123