I think the next biggest invention is going to be in generating power. People are using more and more energy every year and with fossil fuels running out we are going to need a new way to produce the electricity require. The next biggest invention is going to have to tackle that problem. At the moment it looks like nuclear fusion might be the answer, but there is still a lot of inventing and engineering left to do for that work properly!
Today is the final day, so don’t forget to vote! 🙂