Sometimes the question arises of how to tell the different types of STEMs apart. This is not hard, at least for STEMs, but for Bogs?
For now, I shall limit myself to describing how to distinguish Science NERDs for Engineering NERDs. Since matters of attire and appearance are greater among disciplines, these cannot be reliably used to distinguish scientists from engineers. The approximate density of slogan emblazoned shirts versus button-down shirts is similar across the disciplines although selection of either slogans or tie patterns are not.
The best way to distinguish an engineer from a scientist is by mind set. Scientists are interested in understanding something while Engineers are interested in building something. This is best illustrated by how these folks use libraries: scientists use the library to find how how much understanding there is on some aspect of reality; engineers use the library to find out how to do something.
One of the sources of confusion is that both scientists and engineers tend to surround themselves with strange and mysterious equipment such as particle colliders and metal bashers. Again, the difference is what end these equipments are put to.