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Bhopal gas tragedy.</h3>
The Bhopal disaster, also referred to as the Bhopal gas tragedy, was a gas leak incident on the night of 2 - 3 December 1984 at the Union Carbide India Limited pesticide plant in Bhopal, Madhya Pradesh, India. It is considered among the world's worst industrial disasters.
The highly toxic methyl isocyanate (MIC) gas can cause death within minutes of inhalation if its concentration exceeds 21 PPM (parts per million). That was the reason for so many deaths and the crippling after effects on hundreds of thousands of survivors for decades, as per organisations.
The answer is the first one, you must always cite your sources, even if you have not directly quoted them. It also adds credibility to your work (this is not the only reason, it is merely an incentive)
I believe it would refer to intelligence quotient.
A divorce can be very hard on a child, instead of learning you'll be thinking if you had any part in breaking your parents up or if not you then who fault was it? mom? dad? some out side force? an annoying sibling? a child has a hard time understanding the fact that it doesn't have to be anyone's fault and some times people drift apart.