If you were to invent.

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Hey Guys, I see now a days a lot many gadgets coming out some of them are really cool and fun to use like a dog tracer you just need to attach a device on the belt and if the dog is lost or it going away from you you get an alert cool thing. I was just thinking if you all had to invent something cool what would you do?? what would be your purpose and what would you name it? Hope to see cool replies Cheers!