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HowStuffWorks, www.howstuffworks.com
Detailed, easy-to-understand explanations of many of the world's products and processes.
On this page: X-Rays to Xbox.
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Title Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 0-9
X:  A

X-Rays (in electricity, medicine, physics)
Xbox (Video Game System)