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What is the difference between sound and noise? How do they affect your hearing? And is noise always a bad thing?
Spending time outside has important physical and psychological benefits. It can even help you learn better!
What are your teeth made up of? What chemistry is at work in your mouth? Why do some people get cavities even if they brush regularly?
This backgrounder explains what noise is, how it is measured, and how it affects our hearing, wellness and more.