How technology is changing the world. Solar Grills/heaters! David Wilson, a professor at MIT, came up with this baby barbecue requiring no use of firewood, coal, gas or electricity to operate. The f...uturistic-looking contraption serves both for grilling, cooking or heating food, and it also serves as a space heater, using only solar energy. Battery life of about 25 hours between recharging. This means that the energy stored in a single day in the sun can be used throughout the night and the next day. Perfect for outdoor cooking in large cities, but especially rural and remote communities. .