When we sing in unison, our hearts start to beat in unison. Or rather our heart rate variability or HRV syncs up with those around us. Subscribe to ABC Science YouTube 👉 https://ab.co/2YFO4Go

This excerpt is from the Australian documentary series, Catalyst. Australians can stream the program now on ABC iview here 👉 https://ab.co/LilysLifeHacks

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