In this video there are most interesting simple science facts where this one is simple and can be done with a tea bag. First of all take a tea bag and empty it out and then place it in the position as indicated in the video and when set fire on one end, it immediately catches fire and fly out. What happened here is when the one end of the tea bag is fired up the fire makes the temperature of the air in the teabag to rise to a certain extent. Once the flame has burned to the bottom, the convection current provides enough force to lift the remaining ash into the sky which seems to be like a rocket launch. Wear glasses for safety.