People who listen to crashing ocean waves feel a lot calmer in 7 minutes. It’s down to something called the “biophilia hypothesis” – our innate connection to living things that we find reassuring and soothing. It explains our desire to care for animals and plants. And hearing ocean waves, rustling leaves, or a gurgling stream taps into that innate desire to be close to nature. Can’t get outdoors? Try one of these free apps: “Ocean Wave Sounds” or “Nature Space.”

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