I, for one, can't really think of any daily experiences that would count as evidence for or against glass being transparent to UV. Maybe if long drives in sunny

I, for one, can't really think of any daily experiences that would count as evidence for or against glass being transparent to UV. Maybe if long drives in sunny weather are a typical experience to someone, it'll be common sense to them, but I'm rarely in a car for longer than couple of hours at a time and I develop tans gradually enough I can't really notice it in span of days, let alone hours. My answer to your teacher's question 1 would be "no idea" since I wouldn't have paid attention to it in the first place. Of course, given a premise "skin doesn't tan when sitting in a car", I think it's a good explanation for the subject.