Mars

Thomas Edison didn't invent the light bulb. In fact, his patent application for it was rejected because it was too similar to a patent filed 30 years earlier. But Thomas Edison was an innovator and he recognized that innovation only mattered if an idea was adopted and created true change.

By finding away to make the light bulb something that could easily be integrated into daily living and accepted by normal people, Edison created enormous change in the way we live. So what are the lessons we can take from this when it comes to innovation in terms of energy efficiency?