What Happens When You Crack Your Knuckles?

A lot of people crack their joints. Sometimes it happens involuntarily, some people do it on purpose. But why does it happen? And is it bad for you? This video explains all. A liquid called synovial fluid lubricates your joints and sometimes ...



news source: Huffington Post:  Lifestyle
news section: Entertainment
published: 16/03/2015 09:56:59

Entertainment

Huffington Post