How many times will the following loop display "Hello"?
Definitions:
Mercury
A chemical element with symbol Hg and atomic number 80, known for being a heavy, silvery d-block element that is liquid at room temperature.
PCBs
Polychlorinated biphenyls, a class of highly toxic chemical compounds used in various industrial applications, now banned or restricted due to environmental and health risks.
Fetal Development
The progressive growth and formation of a fetus inside a woman's uterus, starting from conception to birth.
Natural Experiments
Observational study designs where the subjects are exposed to the experimental and control conditions that are determined by nature or by other factors outside the control of the investigators.
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