60: Percent of UK adults estimated to be adversely affected by their sonic environments. 60: “The 60-60 rule asserts that you shouldn’t listen to music at a volume louder than 60% of maximum for more than 60 minutes at a time.” 70: The percent slower that sound moves on Mars than on Earth. Sources: UK (pipedown.org), 60-60 (zdnet.com), Mars (nature.com)
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