Gauging the Wind
Every school serious about science should have a weather lab, but if yours can’t afford one, Vaavud’s Wind Meter for Smartphones is a good start. At $50, it is a fraction of the cost of a full weather center, but is accurate to within 4 percent and was developed using the wind tunnel at the Technical University of Denmark. The two-cup anemometer snaps into an iPhone or Android’s earphone jack and communicates with the phone via a Bluetooth link; it works with all recent iPhones and some Android phones. The app not only shows current speed, but averages and a histogram of recent wind movement; it works with metric and English units.