My 7 year old participated in a Science Fair with his cousin and his friend, they had a great time learning about how salt can change the freezing time of water. This was for an elementary school science fair, they presented at their booth then gave their presentation to all of the attendee’s.  It was a chance to learn all with science and work on public speaking and presentation skills. You will need an ordinary household freezer set on high Thermometer 4 identical freezer proof plastic containers capable of holding one cup of water Clock Paper Pen Marker Procedure Put the food etc. in the freezer in the fridge or…