Quote 16
It wasn't your fault [...] In your position I would have done the same thing. I don't blame you, and I'm glad your survived. (1.13)
We don't know if we'd be quite as graceful if we were in Mark's situation—frankly, we'd be cursing those rapscallions to high heaven. Still, you've got to admire the guy. Instead of getting bitter, Mark realizes that he sacrificed himself so his friends could live.
Quote 17
Half the people who studied botany were hippies [...] I didn't like them. I've always been in it for the science. (2.35)
Though he once hated them, Mark acts a lot like those hippies during his time on Mars. He composts—his own poop. He recycles—his own urine. He even uses solar energy. Going green has never felt so good!
Quote 18
But I do have a free source of heat: me. A couple million years of evolution gave me "warm-blooded" technology. (7.19)
Sometimes, the best scientific solution to a given problem is to simply use what Mother Nature gave us. After all, our bodies are finely-tuned pieces of technology that took hundreds of thousands of R&D to perfect. That sure beats the pants of an iPhone.