Scientifically investigable vs. non-scientifically investigable questions in biology.
Scientifically investigable question: Do people who drink tea have a higher risk of brain illnesses than non-tea drinkers?
Non-scientifically investigable question: Are people who drink tea happier than people who don't drink tea?
When it comes to scientific investigations, questions that involve subjective experiences like happiness cannot be reliably tested as they are not objectively measurable.
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