"A sigh's not just a sigh - it's a fundamental life-sustaining reflex" - The Guardian. 09-02-2016 17:43 www.theguardian.com/science/2016/feb/08/a-sighs-not-just-a-sigh-its-a-fundamental-life-sustaining-reflex?utm_source=esp&utm_medium=Email&utm_campaign=GU+Today+main+NEW+H&utm_term=155648&subid=17928655&CMP=EMCNEWEML6619I2