Watson L. The App That Tells You When You’re Happiest (Unsurprisingly, It’s 1.50pm on Christmas Day)) // Daily Mail,
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Интересный пример есть в статье: Cohen E. E. A. et al. Rowers’ High: Behavioural Synchrony Is Correlated with Elevated Pain Thresholds // Biology Letters 6, No. 1 (2010): 106–108, doi: 10.1098/rsbl.2009.0670.
