Sound needs matter to propagate, so the vast vacuum of space is not just empty − it’s silent.
Academic rigour, journalistic flair
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Urban Prep Academy in Chicago made a name by boasting about its 100% college acceptance rates for graduating seniors. A founding teacher at Urban Prep explains why that statistic is misleading.
When a sound is made, it spreads. And when it hits a hard surface that is far away, it bounces back and comes back to where the sound was made. That’s what we call an echo.
Amazon, Google and Apple’s attempts to understand the tone of human voices can reflect human biases.
