It would be useful in this summary to link back to the 4 competing hypotheses and evaluation metrics... I felt it was pretty structured for the first part of the module but then got a bit less so after discussing the 'ideal experiment'

It would be helpful to also frame this walkthrough alongside the learning from previous classes about the 4 competing hypotheses and the ways to evaluate causal arguments (e.g., chronology, causal mechanisms etc). I think that's what is being discussed in the final paragraph ("alternative causes") and some of the comments in this Discussion thread have been helpful for this.

Could #5 also be:

Pet cats < -- s --> Living in loving home and fantasize about attacking owner?

Is "several" to be understood in the same way as "some"? i.e., at least one, could be up to all/100%?

These videos are really helpful - I'm not aiming for quite as high a score (although obviously that would be nice!) but the message around not giving up, and having those periods of setbacks is the main takeaway.

I'm slightly older (mid/late 30s) and would find it helpful to also have a video or two from people coming back into study a little further from undergrad days.