I have noticed a lot lately that many people have been talking about the 51%. What exactly is everyone talking about? I have yet to find a proper explanation.
I'm also going to say right now:
Those still going on about the 51% have no evidence to back them. Multiple charts show that GHash.io (The pool nearing 51%) Is now below 35%.
Ironically, everyone's freaking out that GHash is at 33%. Because the rise from 20% can just go unnoticed and then everyone cares once they near 51%...

But the 51% paranoia is starting to dissapate. It would be a good idea to educate yourself on the info about it, however, so check out some of the links or google "51% attack".