LIFESTYLE 30/01/2015 05:34 GMT | Updated 30/01/2015 05:59 GMT 10 Unsolved Mysteries of the Human Body 177 AllTime10s SEE ALSO: These Facts About Our Bodies Are Both Gross And Fascinating10 Facts About The Female Body Including What Gives You A Yeast Infection Ever wondered why you're left handed? Or confused by why we yawn? Conversations SUBSCRIBE AND FOLLOW LIFESTYLE Get top stories and blog posts emailed to me each day. Newsletters may offer personalized content or advertisements. Learn more Newsletter Please enter a valid email address Thank you for signing up! You should receive an email to confirm your subscription shortly. There was a problem processing your signup; please try again later Facebook Twitter Instagram Podcast Youtube Flipboard