I'm pretty sure you have learned, or even studied, subjects that are not immediately 'useful' in your daily life, and are perfectly happy with them. I have no practical need to know the size of the Milky Way or the name of the nearest star, or the differences of expressive styles between different artists, or what Umberto Eco says about imprints in the context of semiotics, or how to read the runes of Ultima games, but I'm glad I do know them. These things make me into who I am as a person, practical things only make me into a person of a certain culture and a certain profession.

To be frank, if you genuinely only know things that are 'useful', you are the most boring person in the world.

HOWEVER, I'll grant you that forcing yourself to learn a new language at 40 if you have no need or interest in it would be pointless. But please don't use the 'usefulness' argument, It's OK to say you're not interested.

If I had been tested, I would have reported it.

It's not just that. People usually go to see films in groups, and then you'll tend to get this a lot:

'Hey, the new [major film title starring [major hollywood star]] is out! Let's see that'

'Sure. They have a 2D and 3D version, which one should we see?'

'Well, 3D gives me headaches, so I'm not coming if you decide to go there.'

'Hey, no problem. 2D is cheaper anyway!'

I haven't paid attention to how the real-life 3D films do it, but I guarantee you 3D animations do not have anything even resembling a fixed eye distance: they keep changing it by as much as meters so that they get a 3D effect even in scenes where you normally wouldn't have a significant differentiation between the two views with 'normal' eye distance. I don't believe the eye distance difference is a big factor in 3D sickness, as the differences between people are pretty small in that respect.

I'm sort of OK with what they sell as 3D these days (and what would more properly be called 'stereo picture' or sth), but not all the technologies are the same. The shutter glasses' flicker bothers me, I prefer polarisation. And I'll prefer properly holographic screens when we finally get them.

Sure. Just like the TV was a fad because it didn't kill the cinema.

Was she crying because of the catharsis of her realizing that evolution provides for a more consistent world view than creationism? Or was she distressed because the teacher was bullying her?