Gandhi was an engineer at heart. He improvised and built equipment like better snake-catching tools, small cotton-spinning wheel (takli) and chappals (sandals) from used tires. In 1929, he even instituted an INR one lakh prize (INR 20 crores in today’s value; 2.6 times bigger than the Nobel Prize) for the design of a modern charkha (spinning wheel), writes Anil K Rajvanshi for South Asia Monitor