Use the reaction of the balloons jet to make a jet car.
Materials: four wheels (with shafts) of a used toy car, a disposable chopstick, a used ballpoint pen, 502 glue, and a balloon.
Preparation method: Cut the disposable chopsticks to a moderate length and fix them in the middle of the axes of the two wheels; unscrew the ballpoint pen, remove the half section (the part that exposes the pen tip), and stick it on the disposable chopsticks with glue (It is best to add a small pad between the pen tube and the chopsticks, otherwise it will be difficult to install the balloon). After inflating the balloon, install it on the pen tube. After releasing your hand, the car will drive away automatically! < /p>
