air conditioning in the hot summer months, but it's inefficient, expensive, and extremely unfriendly to the environment. The good news today, however, is that researchers have developed an air conditioning system that could be up to 90 percent more efficient than standard setups. How so, you ask? The new tech, called DEVap, uses liquid desiccants to make dry air using heat and evaporative coolers take dry air and make cold air, making it far easier to cool already dry climates. Additionally, DEVap uses salt solutions in place of environmentally naughty refrigerants, CFCs, and HCFCs -- the main contributors to global warming. The tech is still in the lab, so until then you'll just have to keep fanning yourself off (or having your friend do that for you).