Given how it’s often discussed and described, particularly in the more brazen and annoying ads for puzzle-based app games, you’d be forgiven for assuming that intelligence is something well understood and easily measured, like your weight or height.
The truth is far more complicated, confusing, and even controversial. For one, while the dictionary definitions are fairly straightforward, describing intelligence as, for example, ‘the ability to acquire and apply knowledge and skills’, the scientific consensus on what intelligence actually is, regarding how it should be defined and assessed, is still disputed.
You can read more in an article by Dean Burnett and published in the BBC Science Focus magazine at: https://bit.ly/3Nbh4PH.