Turn two ordinary bottles into a tabletop twister!The Tornado Tube is one of the world’s most popular and unique science toys. Here’s the classic experiment: Fill one of the plastic soda bottles 2/3 full with water. Use the plastic rube to attach to the second bottle. Swirl the liquid in the bottle to create a tornado-like funnel that spins in the bottle allowing the water and the air to trade spaces. Get creative and add glitter, soap, food colouring, and more!