There’s an iPhone app to detect a ripe watermelon. You repeatedly knock on the fruit with phone’s microphone nearby and it analyzes the sound. – WTF Fun Facts
Source: https://www.cnet.com/news/melon-meter-ios-app-listens-for-ripe-watermelons/
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how much money does the app clash of clans make
How much money does the app Clash of Clans make- WTF fun facts