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Materials Two sheets of 9 by 12-inch paper, such as construction or craft paper (if possible, choose contrasting colors) Pencil or marker Ruler A quarter or other round object of similar size Scissors 21 pennies, small blocks or other small stackable objects Procedure To create the triangle: Draw a large triangle on a sheet of paper (you can use a ruler to help make straight lines). Use a quarter to...

Introduction Solar power is power we get from the sun. Unlike fossil fuels, which can cause significant pollution and emit greenhouse gases when burned, solar power is clean and renewable. However, solar power is not without its drawbacks—it is not available at night or on a cloudy day. Solar panels convert sunlight into electrical energy, which can be used to power machines like motors. They must be connected to the motor by wires to form a circuit....

In ancient Egypt, the temple priests had to perform religious rituals at certain times of the day, so accurate timekeeping was necessary. Sundials kept track of time during daylight hours and as long as the sun was out. Because accurate timekeeping during the night was also a necessity, the Egyptians developed the water clock, called the clepsydra (literally, "water thief") in Greek, in the 16th century B.C.E. A water clock is a...

Robots come in all shapes and sizes. Some move on wheels, some walk on legs, some fly with wings, some are as big as a horse, and some can fit on your fingertip! Most of them are made of hard materials. So, what if we could build soft robots that bend, squirm, expand, and contract? Some advantages could result — for example, soft robots might be able to pick up fragile...

Have you ever wondered why ice cubes in your cold drink become gradually smaller, or why their surface becomes smoother as they melt? Does ice always melt this way? To answer those questions, we will run the experiment below: Materials Water balloons Water Freezer Oven mitt Small plates Cup Table Salt Water dropper or syringe Food coloring, preferably liquid Workspace that can get wet Towel to wipe your workspace Optional: Flash...