Mr. Wizard's World

Pepper's Ghost, Creek Transplant, Card Trick, Oscilloscope Alarm, Vapor Trail, Balloon Pressure and more (3x1)

Air date: Oct 10, 1985

Pepper's Ghost - Explains how one can use angles between light and glass to create the illusion of one image transforming into another with pepper's ghost. Free Fall Water - Demonstrates free fall with water remaining in a bucket with holes. Creek Transplant - The thought, hard work, and care that went into rerouting a river in Colorado. Hidden Order Card Trick - Shows how to organize a deck of cards so that a desired card is revealed after drawing and replacing a card for each letter spelling that card out. Oscilloscope Alarm - Explains with an oscilloscope and sound generator how high-frequency (inaudible) sound waves can make burglar alarms. Vapor Trail - Describes how condensation from the disturbance of atmosphere by an airplane can form clouds behind it. Balloon Pressure - Demonstrates how the elasticity of a balloon with less air may counter-intuitively force air into a balloon with more after creating a barometer with fluid, valves, and balloons.