These Window Curtains Use Sand When you see it you will ask yourself why you didn’t invent it and why was this not commercialized before. Facebook Prev Article Next Article Inventions Checkout these cool gadgets... Related Posts Smart Train – It Doesn't Stop To Pick You Up First Manned Flight for Flike Personal Tricopter Generating Solar Energy Through Windows – Catching Invisible Light 2D Photos Transformed Into 3D Sculptures Rechargeable Battery Can Stretch, Twist and Bend Material Goes from Solid to Liquid Only Under UV Light