Answer: Even a noble and heroic person can fall into depravity and ruin.
Explanation:
The atoms in the water cause it to spread.
Its saying basically that there are hidden secrets underneath people. That every smile, nod or wave has a hidden agenda. It's like warning to be wary of who you trust.
In his book "Children of the Drug Wars", Damon Barret evaluates the impact that war has on children and on drugs.
The underlined words and phrases support the author's purpose because they (a) draw attention to the opinion that the United States is not doing enough to help these children. Those words and phrases communicate Barret's view that these children receive a <em>"death sentence"</em> or that the nation has <em>"turned its back"</em> on them.