I think that Google cardboard is the most important invention of 2015. This post is about Google Card Board. Google cardboard is VR (Virtual reality). You can use VR to play fun games like drive a car ( It is very hard) and down load other games. The most fun thing to do, in my opinion, is going to new places like London, or go diving in the Great Barrier Reef, or even go into outer space! If you put a smart phone or Android phone in a piece of cardboard and down load an app, following simple instructions ,you can do amazing thing with Google cardboard. I like Google cardboard because it is cheap so most people will be able to afford it.  I also like Google cardboard because it is made out of simple materials like cardboard and foam. And if you want you can assemble it on your own with some instructions on the web (you have to buy a kit). I think Google cardboard is the most important invention of 2015 because lost of people can use it. 

Do you have Google card board?