Just wanted to say the policy of requiring 50 reputation for posting comments has the unfortunate effect of newcomers being unable to respond to comments directed at them in the appropriate place. Some will give up, others will gain the 50 points and then reply, while others will "hack" it by responding in answers (requires 0 rep). Some will also, in the same spirit, make a further mess of this board by complaining about it on the main site instead of in meta. The mechanisms intended to keep the boards neat might work against their purpose when the rules don't make sense. If I can ask and answer, I don't see how banning me from commenting makes sense.
The particular instance this question is related to: https://cogsci.stackexchange.com/questions/8667/asymetric-bodily-development-correlating-to-asym-brain-development