This activitity is obviously done by/with adult supervision, wear protective eyewear, turn off the fans and make sure you have necessary safety equipment in the house (fire extinguisher etc). This is super fun and simple but not to be done without an adult.
You’ll need an new tea bag (not used), scissors, a non-flammable plate or surface and a lighter of some sort.
Cut the top off the tea bag and empty it’s contents.
Unfold and open up the bag.
Stand it up on it’s end on the plate or other non-flammable surface.
Light the top on fire.
Watch as most of the tea bag burns.
As it gets to the bottom
It takes off into the air!
It goes out shortly after taking off leaving just a bit of ash
It’s fun to watch and you’ll want to do it again!
http://allfortheboys.com/home/2013/8/14/tea-rocket.html
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