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.