'Laughter lowers depression, kills...

... let out boisterous "hahahas" and "hohohos," followed by prolonged laughter. The exercises were components of laughter yoga, a mixture of proper breathing techniques, facial exercises and "faking laughter" for cancer patients and survivors. "Laughter ...

http://www.sunstar.com.ph/cebu/local-news/2013/05/25/laughter-lowers-depression-kills-cancer-cells-284197