Sorry for the late post but I have been a little busy in the last days. I will present you a little trick that you can use in a classroom or in another place where you can find a piece of cioc and a pen.
All you need to do is a little hole in the [...]

All of us have seen the toys with an ocean “trapped” inside, and when you move it, the ocean moves itself an creates nice waves. In this video you can learn how to make a homemade one.

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