Science is fun

Hi there!!
We have started a unit about the human body some days ago, and I have to say it is providing my class with a lot of fun and very interesting situations.
Last day, we tried some easy experiments related to the five senses, as well as funny facts about the human body. The kids had the time of their lives, I can tell you!!

First, we created an artificial lung (just to learn the way this organ works). It's quite easy. You will need: a plastic bottle, two balloons, a straw, an elastic rub and play dough. Once you have it all, just follow this simple instructions:
-Cut the bottle and keep the upper part.
-Cut one of the balloon's top, tie a knot at the bottom and then use the balloon to close the base of the piece of bottle you've kept.
-Put the straw inside the other balloon and secure it with the elastic rub (be careful not to strangle the straw).
-Put the balloon inside the bottle (be careful, the balloon mustn't touch the one at the bottom) and close the neck of the bottle with play dough (again, be careful not to strangle the straw).

If everything's ok, when you pull the bottom balloon (which is acting as the diaphragm), the one inside the bottle (the lung) should blow up, and when you let go it should go flat. It really works!!

Another experiment put us in touch with static electricity. It's even easier. You will need: a bowl, some salt, some pepper and a plastic comb.
-Put some salt and pepper in a bowl and mix.
-Rub the comb against your clothes or hair for a while.
-Put the comb over the bowl (close enough).

If everything's ok, the pepper will go up, attracted by the static electricity in the comb, but not the salt. It's really funny, kids love this one.

Enjoy!!