There are many theories around for why we cry and what may be happening in our bodies when we're doing it. But the research on all these things is fairly mixed, and culture plays a big part.
Whether we're happy or sad, it doesn't take much to turn on the waterworks. But how and why do humans cry?
New research tries to suggest mothers' responses are pre-programmed, but there's a problem with the evidence.
The chemical formula behind your tears.
That deafening din was millions of years in the making.
Football, cricket, athletics, rugby – whatever the sport, the tears are never far away, for both the stars and the spectators.
It appears that the days of the stiff upper lip are over – but there are some who will still take the opportunity to criticise.