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Abstract Solar cells are popping up on rooftops everywhere these days and are a model for clean, renewable energy. Did you ever look at those solar panels and wonder how we can get electricity produced by solar cells when the sun is not shining? It is a great question because solar panels do not produce electricity when it is dark outside. One strategy to overcome this challenge is to store the energy...

Introduction Have you ever wondered how strong hair is? When we talk about our hair we usually discuss color, length or texture. But what about hair strength? If you look at a strand of hair, it looks like a very thin string. In fact, it is on average only about 0.1 millimeters thick. It doesn't seem like such a thin string could withstand much force. How much weight do you think...

We use passwords every day for our email and other computer accounts. How secure is the password that you use? How hard would it be for someone to guess your password? How hard is it to write a computer program to guess a password? You can see for yourself by writing a simple password guesser in the computer language Python. PREREQUISITES Experience with Python or another programming language. MATERIAL AVAILABILITY Computer with internet access...

The type of telescope you will build in this activity is also called a monocular or a spyglass. Materials Double convex lens, 38 mm diameter, 500 mm focal length Double concave lens, 38 mm diameter, 150 mm focal length Cardstock (2 pieces) Scissors Tape Instructions Start at a short edge and roll one of the pieces of cardstock into a tube so the outer edge of the tube lines up with the edge of the concave...

Abstract Do you filter your tap water before drinking? Many commercials claim these filters make your drinking water cleaner and safer. But what, exactly, are these filters doing and is the water really cleaner afterwards? The cleaning power comes from their filling material, called activated carbon. It exists in all kind of forms: powder, granules, foams, and blocks. Do you think it matters what type of activated carbon is inside the...