Since some people say that I'm tilting the ruler to make the cart move right or left, a quick demonstration to show that this isn't the case.

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Why do people test a wind-powered cart on a treadmill? Wind is the relative movement between air and something else (usually the ground). We usually think of the ground being stationary and the air moving, but it works just as well to have the air stationary and the ground moving.

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Another model demonstrating the principle of the cart that moves down wind faster than the wind. Inspired by some ideas posted on the discussion at forums.randi.org, I made a simple cart that is propelled underneath a moving surface, faster than that surface. The large wheel, turning against the direction of movement of the ruler, is very similar to the propeller of the wind-powered cart, turning against the wind.

The next episode is here: http://www.youtube.com/watch?v =9Yt4zxYuPzI

PS. Several people have asked where Louise comes from. She was made in Sri Lanka for Barefoot: http://www.barefootusa.com/New Files/toys2.html

If you want to read more about downwind faster than the wind:

http://peswiki.com/index.php/D irectory:Directly_Downwind_Fas ter_than_the_Wind

http://dwfttw.blogspot.com/200 8/12/comments-questions-disagr eements.html

http://karmatics.com/dwfttw

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An ex-Cotton Club hoofer, Ralph Brown dances to Charlie Parker's Ornithology in Jivin' In Be-Bop (1947). Cool.

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Created by children's author and illustrator, David Hyde Costello. Check out his website, www.davidhydecostello.com

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http://richarddawkins.net/grow ingupintheuniverse

Oxford professor Richard Dawkins presents a series of lectures on life, the universe, and our place in it. With brilliance and clarity, Dawkins unravels an educational gem that will mesmerize young and old alike. Illuminating demonstrations, wildlife, virtual reality, and special guests (including Douglas Adams) all combine to make this collection a timeless classic.

The Royal Institution Christmas Lectures for Children were founded by Michael Faraday in 1825, with himself as the inaugural lecturer. The 1991 lecturer was Richard Dawkins whose five one-hour lectures, originally televised by the BBC, are now available free online, courtesy of The Richard Dawkins Foundation for Reason and Science. The entire 5-hour program is also available on a 2-DVD set through our online store. http://richarddawkins.net/stor e/index.php?main_page=product_ info&products_id=5

The DVD includes subtitles in English, Spanish, French and Polish.

Read the transcript:
http://richarddawkins.net/GUIT Utranscript

If you enjoy these free videos, please consider purchasing the DVD and/or making a donation to The Richard Dawkins Foundation for Reason and Science to help us continue our work. Donate here: http://richarddawkinsfoundatio n.org/donate.php

Originally broadcast as The Royal Institution Christmas Lectures for Children, 1991.

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