What is a tornado? How do they form? Learn all about this extreme form of weather and make your own tornado in a bottle, safe at home - no need to worry about ending up in Oz!
You'll need two identical large plastic bottles, a small piece of thin plastic (eg the lid of a tub of yoghurt, ice cream tub lid, or a microwavable lid), a marker pen, a hole punch, some scissors and duct tape (or any waterproof tape).
Make sure you have adult permission and supervision before attempting this experiment at home. Watch on YouTube.