Your phone has a 100 million-times more computing power than the Apollo guidance computer that landed men on the moon! How many times have you heard that? In fact, that is probably a reasonably true statement, and perhaps even underestimates just how powerful today's phones are. But one thing hasn't changed much since 1969, or even since its invention in 1925 - the dynamic loudspeakers in the astronaut's helmet headsets.
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