Is it true that we yawn when our brains are deprived of oxygen? Most of us can feel a yawn coming on. The muscles in our jaw begin to tighten, our nostrils might flare, and our eyes might tear up as ...

Ever noticed how one yawn can trigger many? Science reveals how your brain copies others, why yawns spread so easily, and ...

PARIS (Reuters Life!) - We do it when we're tired, when we're bored or when we're hungry; parachutists have been seen to do it before a jump, and research has even suggested a link between yawning and ...