10 Already Existing Gadgets Straight from Sci-Fi Books

5. Knops – The Volume Button for Your Ears
Imagine being able to mute your surroundings, or make everything louder, if you so desire. That’s like the best superpower to have while commuting to the office.

6. Invisibility Cloak
A Japanese inventor somehow managed to create a nearly perfect invisibility cloak. It didn’t go unnoticed!