Are yawns passed on from person to person?
Do yawns travel the globe; as people of all nations, all creeds, succumb to the inevitable copying of the yawn they have just observed?
Are yawns like a Mexican wave? A chain reaction? Passing across humanity like an unheard scream?
How many are there? How many are travelling from person to person at any one moment? How many open mouths and deep breaths are currently occurring, right now?
And, what happens if a yawn is unseen? Does the yawn die?
Do yawns only continue to exist in this world because several people seeing a single yawn will replicate it, twin it? Maybe twinned yawns compensate for dying yawns? Maybe this is how the yawn species survives? Clever.