Here’s a simple test to determine the intelligence of a small child:
Pry open a large binder clip. Ask a child to put their finger in the binder clip.
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If the child puts their finger in the binder clip, the child is probably dumb.
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If the child refuses the request, the child is probably smart.
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If the child slides their finger horizontally into the space at the back of the binder clip, the child is probably a genius.
This test would probably work on adults, too, but it’s socially awkward to ask an adult to put their finger into anything, so I would advise against it.