Do scientists believe that anything is unknowable?

you can't know what happened before the big bang (if the big bang did in fact happen)!

Physical theorists are suffering an intractably hard time trying to predictively model phenomena within a Planck distance. Nobody has any idea what originates sentience.

Nobody with more than a room temperature IQ can undestand NASA or the Commander-in-Chimp Bush the Lesser.

Well philosophically speaking, it is not possible to understand everything. We can never understand ourselves. That is what Godel's theorem is about as I heard somewhere. I am no mathematician though, I could have misinterpreted it. But this does look a little bit ironic, doesn't it =)

This scientist thinks that every thing that exists is understandable. Eventually.

yeah... how does anyone explain the existence of the universe or this realm... like why does this whole place exist? just because... we dont and never will know

How could they know if it was unknowable?

heck no.... their is a reason for everything. each action has a = and opp reaction...