There are 62 people aboard the ship. Not only do they fall into
four mood types, they also fall into four job categories: 
Engineers, Scientists, Medics, Security. 
As you'd expect, being stuck on a bucket of bolts that's heading
for certain death (always the optimistic!), there's bound to be 
a little friction. The Engineers basically don't like the 
Scientists due to a major difference of opinion. So when you 
help an Engineer, those stuck-up smartipants Scientists are
usually a little less likely to lend assistance later on.