[@Lalliman] lol, I've never seen that myself except in silly anime-like RP's where it honestly makes more sense, but yeah if you're going for a realistic RP you should take care to show, not tell, how smart your character is.

Which is why I honestly believe that you have to be a genius to play a genius. And part of that might be having a lot of knowledge about a given topic. 

It's easy to downscale knowledge (anyone can play a dumbass that knows nothing), but it's very very hard to upscale knowledge (you can't know what you can't understand) and thus it's hard to play a character that is 'above you' so to speak.