I don't even think you need to be in the sciences. Perhaps it's a result of a protestant upbringing, but I grew up in blue-collar America where virtually everyone was a tradesman. If I may generalize: these are people that while they might complain and dislike going to work, they feel deep satisfaction about contributing back to society.

Or maybe it's that with trades you have a direct connection to the work you do and the effect it has on the world.

Either way I think we could learn something from them. White collar types seem to want to avoid work at all costs. Work isn't to be avoided. In fact if you measure your life by how much it affects others, it's probably the most important part of your life.