I've had a look around, but can't see this mentioned on here, so apologies if it's been done.
I find this absolutely fascinating; could it also point to the ever increasing pass rates of exams?
I suppose there's a history of discovering things that we surround ourselves with cause us harm (arsenic in wallpaper etc) but it makes me wonder about all the things that we expose ourselves to as a society. For example; antibacterial wipes/cleaners, diesel particulates, 'conditioned' air, fortified foods, washing products, deodorants etc etc.
Mind you, it's easy to come over all Daily Wail about it eh?