Humans also smell fear

It is possibly our intuition and also depending on the expressions seen on others that we show our own emotions of fear,disgust etc...If researchers have found this, I am sure that they have a valid reason for it , however it may come out only during extreme cases

Whenever we did any mistake we fear for that.Sometimes we just escape from the hands of others but many people are there around us by seeing those faces we feel fear of being caught.The expression of their faces show that they could say some thing to us.

Fear is a natural instinct that humans can smell like animals. After all, man is basically an animal.

http://www.dnaindia.com/scitech/report_humans-can-smell-fear-like-other-animals_1761378

Man is the direct descendent of Ape. half human and half animal. No wonder if man imbibes the qualities of man and animal

Forth coming danger is very well identified by the animals. Their sense will more active then us. Humans have presence of mind and a sixth sense which can make them realise the coming danger or happenings.

Human have good sense of humor. When any danger arrives they can easily understand it beforehand.