Why do we yawn and is it contagious? : vimarsana.com

Just reading about yawning can trigger a yawn. How come? The question has puzzled us for millennia – and is still wide open.

Related Keywords

Bern , Switzerland , Nottingham , United Kingdom , Japan , Italy , Melbourne , Victoria , Australia , London , City Of , South Africa , France , Italian , British , Britain , French , Liz Wyse , Idris Elba , Anna Mccrossin Owen , Adrian Guggisberg , Yossi Rathner , Olivier Walusinski , Andrew Gallup , Robert Provine , Stephen Jackson , Holly Thompson , David Cunnington , University Of Pisa , University Of Melbourne , University Of Nottingham , University Of New York Polytechnic Institute , Australasian Sleep Association , University Hospital Of Bern , Elisabetta Palagi , University Hospital , Getty Images , Apolo Ohno , Winter Olympic , State University , New York Polytechnic , Victorian Era Britain , ,