Translation of Rückenmark

I am a little confused with all the different domains and products and options on this website. Thanks a lot in advance for the fast response. It is really crucial to my students and to the other teachers.
But we need to asked ourselves why we actually are built in such a way that we so easily dislike others and build stereotypes. What leads to such behavior even in well educated individuals?
Fortunately the bay we anchored was very calm and the ship did not move at all, or at least one could not feel it. We prepared for dinner and went to the deck, where everybody else was sitting.