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As far as gadgets go, the world completely changed during the 1980s and '90s. Think about it -- we started the '80s without VCRs and answering machines, and by the end of the '90s, most of us were running around with tiny cell phones in our pockets. Can you guess which of these iconic gadgets was introduced in which decade? (Many of these products were introduced in Japan or Europe first, but for the purposes of this quiz, we'll stick with the North American launch dates.)
Some materials are better conductors of sound than others. Most speakers work best when you don't put anything on them. But some others are louder when you put them on another surface.
