The third player in the new, quasi-military campaign is the only one to create an entirely new character. Instead of a soldier, she creates a scientist, Liz Shaw, leaving a bunch of NPCs to wreak action-filled havoc backing up the Brigadier. In some respects, the character is a more down-to-earth version of Zoe, and while lacking the same level of genius, she is, if anything, even more of a pure Science Geek.
In the real world, scientists are only highly knowledgeable about specific, narrow, fields - or at least they have been since about the early twentieth century. In the world of TV, however, being a scientist tends to mean you're skilled at pretty well anything science related, unless the show itself is focussed on some particular field. DWAITAS, and many other RPGs, tend to follow this approach, so we can say that, yes, Liz was very good at science, and leave it at that.
For some other systems, however, we might need to clarify just what she's good at. Even in DWAITAS, there's a valid question as to whether she has a speciality, and, if so, what it might be.