Do you believe the human soul exists? [Spirituality & Religion]

I think there's about 1001 other explanations for that, other than the existence of the soul.

Think about what it is you're saying for a minute; that the soul 'weighs' something. If it did have an empirical weight, then it therefore necessarily manifests itself in our physical reality, and thus should be detectable via the scientific method. So where is it then? Why haven't we found it yet? Probably because, it isn't there (not physically, anyway).

Also, the data that Duncan MacDougall collated that led him to make this conclusion has been thoroughly debunked by the wider scientific community, from what I've read.

Those experiments took place in 1907 apparently and were never very convincing. I don't think they are relevant to whether souls are real, though.

See http://www.snopes.com/religion/soulweight.asp

I think that it's possible that it does exist and that it's impossible to prove either way.

The "soul" to me is the spark of life that keeps us going.
Even my dog has that spark.

Only theory is air leaving your body

Nope

That study has since been debunked

I only believe in soles, not souls. ;)