This improbable membrane can trap flies in a jar—and odor in a toilet Reverse filter lets bigger things through, hold back smaller things. Facebook Prev Article Next Article Inventions Checkout these cool gadgets... Related Posts Future Helicopters Will Be Multirotors and Electric Jet-Injected Drugs – No Needles GoSun Stove: Portable, High Efficiency Solar Cooker This Laser is Keeping Crops Safe Paper Generators – Children’s Books Will Never Be The Same Again Scientists Create 3D, High-Capacity Soft Batteries Using Trees