The correct answer would be lead paint. Even though there has been a decline in the amount of lead based paint that is used nowadays, still the largest source of lead poisoning in children in America comes from dust and chips from deteriorating lead paint on the inside walls of their homes and schools.
Emotions can be harmful to you if not handled properly. Let’s say you tend to bottle things up and never really express, you can become depressed or suicidal or act in ways that are harmful to your health such as starving yourself unconsciously because of what someone might be saying to you
We really need both for munitions reasons you would never realize how much tech and science we use in a daily basis