The idea sparkled at a wedding party where we were wondering whether Rabarbar was a fruit or vegetable. All people involved in the discussion now know it is in fact a vegetable.
fruitorvegetable.com is a app and site where you can guess whether something is a fruit or vegetable. It makes use of the hot or not principle but is certainly a lot more difficult except if you know the rules that define the botanic definitions.
So the app can be used in classrooms too.
webnu 