By Don; Ruchlis, Hy Herbert
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Additional info for Mr. Wizard's 400 Experiments in Science
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Keep magnets away from music tapes, cassettes, video cassettes. and computer disks or tapes. Do not do these experiments in the same room. You may accidentally erase your tape. SCIENCE PROJECT Does the needle of a magnetic compass point exactly north? Take a compass out-of-doors in a place far from a building and from iron objects. Mark on the ground the direction in which the dark end of the needle points when it comes to rest. Now find the direction of true north at that spot by observing the shadow of a tall stick.
Make two strips of nylon about 12 inches long and about 3 inches wide. An old nylon stocking is good for this purpose. Place both strips on blank white paper Cut some pieces of thin cotton and nylon thread of different lengths. Bring a charged comb near the ends of the threads and make them stand up and weave about like snakes being “charmed” by music. Notice the difference in the actions of nylon and cotton thread. and rub them tightly with your hand. Lift up the two pieces and place them between your fingers, hanging downward.
There are also neutrons in the center which are neutral (have no charge). If there is so much electricity in body all the time why don’t you feel it? scientists have found that under normal conditions there are an equal number of protons and electrons in each atom. The same is true of your body. The (+) charge of a proton cancels out the effect of the electron’s (-) charge. y notice the electricity when there Is more of one than the other. In other words after you shuffle across the rug and pick up extra electrons you can feel the motion of these electrons when they jump out of your finger to the radiator.