This study is not a randomized controlled study and it lacks even modest efforts at statistically controlling for confounding factors. It is therefore not possible to draw any meaningful conclusions from it. It appears science education is not what it used to be. For a comparison between outcomes for two groups to be informative, those groups must be selected in a way that structurally eliminates the possibility of confounding factors. If that is categorically impossible to achieve, then a well-constructed study will seek to control for all conceivable confounding factors by sampling other variables and statistically controlling for the possible influence of those variables. This is not hard.