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Urgent warning to parents over dangerous ways to cool their kids off in the garden
WITH heat health alerts sweeping across England and temperatures set to soar to a scorching 33C this weekend, parents across ...
Johns Hopkins Medicine6 天
How Do Hearing Aids Work - Johns Hopkins Medicine
How Do Hearing Aids Work? Hearing aids work by amplifying sound through a three-part system: The microphone receives sound and converts it into a digital signal. The amplifier increases the strength ...