Nails made from lasagna, racquetballs that shatter like glass, exploding pop bottles and rags that don't burn? All part of the annual science demonstrations for fifth graders at Calvin College by ...

Short demo: The fan in a vacuum pushes air out, creating a system of low pressure. This in turn creates a system of low pressure within the bag, allowing for an entertaining demonstration of the power ...

Watch this fascinating demonstration of air pressure at work. Notice how the egg vibrates as the heated air escapes around it, and how it gets smoothly pushed into the bottle by atmospheric pressure.