Here are just a couple examples: 1. We can quantitatively study environmental factors that influence intelligence. For example, we know that even low concentra

Here are just a couple examples: 1. We can quantitatively study environmental factors that influence intelligence. For example, we know that even low concentrations of lead in the blood are linked to lower IQ. Knowing what can hurt our mental abilities allows us to protect ourselves via environmental policy. 2. It's not uncommon that a child who is inattentive at school is high IQ and is understimulated by going at the normal classroom pace. Testing allows identification and targeted enrichment opportunities.