More formal tests are available but they are unlikely to be good for testing changes between days.<ref>https://psychology.stackexchange.com/questions/15/public-domain-scientific-intelligence-test-available-for-use-in-research</ref> | More formal tests are available but they are unlikely to be good for testing changes between days.<ref>https://psychology.stackexchange.com/questions/15/public-domain-scientific-intelligence-test-available-for-use-in-research</ref> |