Hi Edward,
We carry out our experiments on humans! Have you seen the pic on my profile page. So we test older people ~ 70 years old on intelligence tests, that test your ability to remember things, how quickly you think and how you reason. We also have their DNA so then we test their genes. And we use both this information on the intelligence tests and DNA to see if they relate with each other. Please ask any more questions if you like! Lorna
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