I came across this amazing set of videos on grassroot innovations in India. I'm posting some of the interesting ones here.
An umbrella that blocks 80% of UV radiation
A non-electric paddle-driven washing machine
A bicycle that runs faster on bumpy roads
A remote control to burn crackers and avoid fire accidents
Honey Bee Network maintains the biggest database on Indian grassroot innovations & contemporary/traditional innovative practices.
http://knownetgrin.honeybee.org/innovation_database.asp
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