While from 2004 to 2012 total UK fertility increased from 1.80 to 1.98, the fertility rate for non-UK born women actually /decreased/ from 2.50 to 2.29 (albeit in a slightly messy non-monotonic fashion) while the fertility rate for UK born mothers /increased/ from 1.69 to 1.90 quite monotonically.
It would be interesting to see the stats including 2nd and 3rd generation immigrant mothers (i.e. born in UK both with parents born elsewhere).
I wasn't aware of UK-born mothers' increased fertility rate.
However, I'll argue that even if the fertitily rate of immigrant mothers decreased, this can explain the data because if more immigrants came in, the average fertility rate goes up (given that immigrants' decreased rate is still quite a bit higher than UK-born).
You can render the images on the sides of a cube with 90° fov, put your viewpoint in the center and that's it. Once I programmed something like this and it works pretty well. I suppose that Google street view works in a similar way but I can't back this up.
Were they playing anything or just walking around in the demo? I have one and have tested it out with many people. When people get sick it's usually because they've been in one of the less interactive demos just sort of looking around wiggling the mouse etc. The people who I let loose straight onto Half-Life 2 or other games where there is some sort of goal rarely get the same type of nausea. I think this is worth taking into account when people say "it's nausea inducing".
For insta-nausea put someone in the Tuscany demo and move them around while they wear the rift. Hilarity ensues!
We did one demo that was more or less floating above static terrain, and another with Half-Life 2.
My own nausea didn't actually start up until HL2. We were playing on a laptop (probably not enough horsepower), using slightly unfamiliar keyboard & mouse controls. So some movements were very fluid & second-nature to me, while others were jerky and off because of the slightly-off control scheme.
It's possible the most nauseating moment was taking the headset off, actually. Up to that point, my mouse hand had been a pretty accurate proxy for my in-game hand and arm, but taking my hand off the mouse and then ripping the "world" away with that same (now "phantom") hand was deeply disconcerting.
But it's also possible the nausea built up slowly over the course of playing. I'd love to spend more time with it to see if it's something you really can adjust to.
On the subject of movement while wearing a VR headset, it seems to me that most successful games will be those where your character remains seated. Flight simulators, space combat sims, mech games, stuff like that.
For that kind of game, just the Rift and a joystick should provide an amazing experience.