Translation of punto de ebullición

I grabbed a burger from an American fast food chain and swallowed it immediately, as I had not eaten for a while. I boarded the machine and could feel a slight stomachache but decided to ignore.
Wars and struggles are always or mostly based on ignorance, fears and disrespect of the enemies. Unfortunately, the kind of hate which roots in previous wars never stops. Let me be clearer, please.
She started to walk with us and one could observe that she had lost some of the naivity many children have, due to the fact that she started to be a sales person long before she reached twelve.