How did the paper machine fly by itself?

Phenomenon: Paper airplanes fly into the sky automatically.

Exercise: The magician took a pair of scissors, cut a piece of white paper into several planes and said, "Now I'm going to let these paper planes fly by themselves. Do you believe it? " Answer: "No!" How to fly a plane cut out of paper? Is this not a joke? The magician put these paper planes on the sunny table, and soon they all flew slowly into the sky! The students applauded, jumped and jumped, and everyone was intoxicated with joy. ...

Principle: Before the performance, the actinolite is ground into fine powder, mixed with glue and smeared on white paper. After drying, draw a plane on this paper. Cut it into paper planes according to the drawings during the performance. Of course, it's not necessarily just a plane. It can also be cut into pigeons or other flying objects. Put the paper plane in the sun and it will fly. Composition of actinolite: Ca2(Mg, Fe++) 5s [si4o11] [h] 2. FeO accounts for 6% ~ 13%, CaO accounts for 13.8%, MgO accounts for 24.6%, SiO2 accounts for 58.8% and H2O accounts for 2.8%. Actinolite is a silicate mineral. After crushing, it is often needle-like in fiber bundle, elastic and contractible. Under the irradiation of sunlight, it is in a stretching state, which can increase the buoyancy of the paper plane in the air and make the paper machine fly. But it should be noted that this magic can't be performed without sunshine.