SPEED OF SOUND - Mr. Wizard measures the difference between hearing the sound of a starter pistol over the walkie talkie and hearing it through the air. SELECTIVE REFRACTION TRICK - Mr Wizard shows Stacey how light refraction plays tricks with inverting images. HOW MANY STARS - When you look up at the sky at night, how many stars can you see? On a moonless night with no clouds, you can count as many as 3,000 stars. But that’s not even half of it. GLASS DUET - Mr.Wizard and Tanis stand in front of a row of drinking glasses. Tanis taps the side of each glass to produce a different sound. They agree that the sound comes from the vibrating glass. SPELLING CHECKER - Mr. Wizard types into the computer a sentence with several spelling errors. He explains that the computer has a disk with perhaps 50,000 words on it. The computer will compare every word Mr. Wizard has typed to the 50,000 words on the disk. AFTER A FOREST FIRE - Specialists from the U.S. Forest Service examine the area that has been devastated by a forest fire and in a matter of days, a forest rehabilitation plan is put into action. WINDOW OSCILLATION - Jason looks at a cut-out drawing of a window attached to a stand and made to rotate via an electric motor. He stands at a distance and looks at the window with one eye. The window appears to move half a turn to the right and then half a turn to the left. Mr.Wizard explains and demonstrates oscillation. ASPARAGUS - This is the top of a plant you no doubt have eaten. The bud has been opened up so you can see some of the parts inside. Eventually, the parts would have grown into many fine branches that give the mature plant the look of a fern. Long before that can happen, the young shoots are harvested and end up on your plate as asparagus. FINDING THE HEIGHT OF A TREE - Mr.Wizard suggests measuring the height of a tree outside with the help of a pan of water. He has it all drawn out for Leila on a piece of paper.moreless
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