Step-by-step tutorial
Step 1
Punch a hole in the card and tie onto a tree branch or gate with the twine. We decided to hang three cards to see if we got different results in different locations.
Step 2
Smear the petroleum jelly over one side of the card, and leave out in the wind. If you like, make a prediction of how much you think you'll catch in each location.
Final result!
Return in an hour or two and see what was blowing in the wind! Write up a chart and use it to help compare what you predicted with what actually happened. Writing down predictions is always a good lead-in to discussions about the things you got wrong and why!
