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 Graphene Ink Will Let Us Print Circuits on Anything Pouring Saltwater Over Graphene Generates Electricity Super Sand Removes Carcinogens From Water in This Filter Opposed Piston Opposed Cylinder Engine The Innovative Machine That Makes Building Roads Easy Revisiting the Microalgae Lamp which Absorbs CO2