But even if I did transfer a virus over on the USB stick, surely nobody could access my private keys if the tablet I generate them on is never connected to the internet. Am I right?

So my bitcoins are gone forever???

I have been mining with 6x r9 280x. 4200 - 4100kh/s avg. but for some reason i dont find it profitable cause i only get 0.02-0.03 btc a day (scrypt -> exchange) . is that normal? or do you guys have some techniques or something.

I want to know properties and characteristic of this bitcoin.

So if I made more than 28 posts in a two week period I'll ever more messages than Activity?

Is this a recent development?  Used to be much simpler iirc.

This has been discussed many time on the forum so i would suggest OP to lock this thread  and just use the forum meta section for the answer and if OP is lazy to do that then just use the search button of the forum. Its always good to google and search forum before creating a new thread for help and questions !!!