Is there a general factor of intelligence?
Interesting article but it neglects a very important factor in its comparison of physical test results and mental test results, namely the extent to which physical and mental capabilities are trainable.  It&#x27;s a simple exercise to, just take the lower half of the cohort in each categorty (mental&#x2F;physical) in a given study and give them intensive one-on-one training in all areas for a year, then compare their performance on said mental and physical tasks after that training.  Doing this for different age groups might be particularly interesting.<p>There&#x27;s often a bias towards assuming that physical skills are trainable while mental skills are not, because many people have been raised to assume that the latter are due to mainly to genetic factors.  This &#x27;genetic superiority&#x27; is typically then used to justify current class structures, racial makeup of the wealthiest 1% etc.  Such views have little if any supporting scientific evidence - mental skills are just as trainable as physical skills (yes there&#x27;s a genetic component in both cases, which might place an upper bound on one&#x27;s performance, but such genetic factors are not correlated with race&#x2F;gender&#x2F;etc.).