Scientists Invent a Way to Brew Espresso With Ultrasonic Waves—No Hot Water Required

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U.S. scientists have invented a method to brew espresso using ultrasonic waves instead of hot water, which reduces energy consumption by 75 percent while producing coffee comparable to conventional espresso.

Researchers have demonstrated they can make coffee comparable to conventional espresso using ultrasonic waves. Because the process doesn’t need hot water, it consumes 75 percent less energy.