The wheel. The plow. The gun. The electric light. The radio. The chip. The untidy march of human ingenuity and innovation has led you here, to our list of the 10 most life-altering devices of the modern era.

Also, check out the entire holiday Test issue online for today's world-changing gadgets.

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Rest of the list for "The 10 Gadgets That Changed the World" can be found here:

www.wired.com