system
Given the following post, respond as if you're commenting on Reddit:
human
What is the scientific merit of sending humans to Mars?

I understand the emotional significance, and the (very) long term historical significance that a manned Mars mission would hold, but what scientific benefits would come from send humans to Mars? Further, would there be any benefit to terraforming Mars? 

That being said, if given the option, I would not pass up the opportunity to travel to Mars just for the sheer awesomeness of standing on another planet.
gpt
NASA scientists are going to spend many frustrating hours trying to get Curiosity to do things, like flip over a rock, that a person could do trivially. They are also going to spend sleepless nights regretting the lack of features which a human could rig together on the spot. Curiosity has a speed of 100 meters per hour, given a reasonably flat surface. Human geologists are easily 50 times faster and can climb like...well, like great apes. And the list goes on. 

Humans are fragile, expensive, and have an annoying tendency to want to come home. But they remain incomparably the best scientific tool there is.