This is not magic, it’s real science through small experiments. A suspended card has no load-bearing capacity, but if you fill the glass with water, the card will have a very strong load-bearing capacity. Attach a magnet to the negative pole of a battery and a copper wire to the positive pole, and this demonstrates the principle of a rotating motor.
Drilling a hole in the base of a ceramic cup usually breaks it, but if you place it in water and then hit it, you can easily make a hole. Why is that? Put water-absorbing resin into a cup and add water to mix; it will quickly expand, creating fun artificial “blood.”
Dip a cotton swab in white vinegar and write a secret message on paper; it will only appear slowly when heated. This is the secret of “invisible writing.” A straw can’t pierce a potato, but if you cover one end with your thumb and push quickly, it will easily go through the potato. This is due to atmospheric pressure.
Place two pencils in salt water and connect the upper ends to a nine-volt battery; you will see the water decompose into hydrogen and oxygen. It’s not enough to just read about science, do experiments with your kids for a hands-on experience.
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