Circular reasoning : Finding PI
IntroductionMathematicians look at the world around them in terms of numbers and formulas, and now, you can discover the formula...
IntroductionMathematicians look at the world around them in terms of numbers and formulas, and now, you can discover the formula...
Build a Disk Siren Introduction If you live in an urban area, you probably hear them almost every day: sirens. Police cars,...
Abstract When you go to the supermarket, how do you pick out ripe fruits and vegetables? You might look at their...
Abstract Have you ever seen clothing with built-in lights? This might sound like something out of a science-fiction movie, but electronic textiles (or e-textiles...
Abstract Solar cells are popping up on rooftops everywhere these days and are a model for clean, renewable energy. Did you...
Introduction Have you ever wondered how strong hair is? When we talk about our hair we usually discuss color, length or...
We use passwords every day for our email and other computer accounts. How secure is the password that you use?...
The type of telescope you will build in this activity is also called a monocular or a spyglass. Materials Double convex...
Abstract Do you filter your tap water before drinking? Many commercials claim these filters make your drinking water cleaner and safer....
Abstract Can humans grow food in space? Can we grow plants on the Moon or on a space station? This is...
Abstract Have you ever suffered from poor Wi-Fi reception for your smartphone, tablet, or laptop? Certain materials can actually block a...
Abstract Watching a spacecraft launch is an amazing experience. It is thrilling to see it lift off and escape Earth's gravity....
Background If you have ever used a wheelbarrow, you know it can help you lift heavy objects; lifting the handles of...
Abstract Soap comes in many varieties and forms—from bars to bottles to boxes. The uses for soaps are just as expansive—from...
Abstract Did you know that you can measure the speed of light using a microwave oven, some egg white, and a...