text by    Douglas Allchin

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My appreciation for the "costly helping behavior" of several colleagues: Clark Barrett, Mark Borello, Robert Cooper, Elizabeth Cowles, Robert Dennison, Paul Farber, Todd Ganson, Stuart Glennan, Sherrie Lyons (and her students), Dan McShea, Randy Moore, and Alex Werth, as well as members of the AAAS Section L Organizing Committee.
Also, I want to extend special thanks to those who provided images to help render the concepts more vividly.
Images and Image Credits


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