Hmm ..
Can something be real if you don't know what it is ?
See, if something can be measured .. ie: confirmed that it possesses distance, time or form, then it must exist in the physical world.
It is therefore physically real.
Mind you, I agree with Steven's take on it. But just because we don't know what it is, doesn't mean that its not real.
So, (against my better judgement), if pushed, from a purely scientific perspective, I think by this definition, I'd have to concur and say I agree with this guy, Blake.
I could also claim that it doesn't make any difference to my world whther its real or not, so the question is irrelevant.
Interesting ...
Cheers