The most useful invention in my life is probably the nook tablet. It makes my life so much easier because it holds my books, email and tons of other stuff. Barnes & Noble created the nook tablet. The nook tablet itself is an electronic device with a 7 inch wide screen. It is gray and has a small nook symbol at the bottom. On the back there is the speakers and it is decorated. It also has a USB port, headphone jack, volume and power keys and a micro-sd card slot. I think the nook tablet is awesome.

P.S. Nook Tablet vs. Kindle Fire - results- Nook Tablets Win=http://=http://=http://=http://!!