21C. Teachers of Science

수업 시작전에 환기시키는 목적으로 익혀두면 좋을 듯..

1. Slow motion ball: You need a thick liquid, preferably honey, a heavy ball, and a sphere shaped container. Place the heavy ball in the lower half of the sphere. Fill the lower half of the container with honey a little more than half. If you use too little or too much, it will affect the motion of the ball. 2. Water fire starter. Credit goes to The King of Random for this idea. Be sure to check..