Electricity, solar power, diesel, ethanol, and biofuel are all highly sought after as cheaper and more environmentally friendly alternatives to petrol. At the elite IIT Delhi engineering college, already known for its advances in developing a bio-diesel car engine, it appears that its members are hard at work developing a car that can run purely on any type of bio-fuel. As long as the substance is biodegradable, it can be used as fuel to power the car. To illustrate how just about anything will power the vehicle, the car itself is basically just a mobile toilet on wheels. Insert the biofuel into the toilet bowl (they use bananas in the demonstration), then flush, and enjoy a full tank of fuel. This is much cheaper than loading a car up with petrol nowadays. Of course, the technology is still in its infancy, but we can hope to one day see toilet cars on every street.

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