Matt Hope is a British artist living in Beijing, and in response to the terrible pollution of the city of more than a million bicycles, has come up with the 'breathing bike' - an invention that creates clean air for the rider to breathe as they pedal.
Beijing's air quality, which almost ruined the Olympic Games there, often becomes so bad as to threaten public health - wich puts people off cycling despite it being one way in which emissions could be reduced.
Matt's invention is carbon-neutral, using a pedal-powered generator to power the home-made air filter.
Filtered air circulates through a hose that's hooked up to a fighter pilot mask.
But it's not quite ready to go into production yet: Hope says: "If you ride this in the rain, you could potentially kill yourself."
<p>After an unpromising start, having to be bribed by her parents to learn to ride without stabilisers, Sarah became rather keener on cycling in her university years, and was eventually persuaded to upgrade to proper road cycling by the prospect of a shiny red Italian bike, which she promptly destroyed by trapping a pair of knickers in the rear derailleur. Sarah writes about about cycling every weekend on road.cc.</p>