That Make No Sense

We got our new md/phd program facebook today. I brought it back to lab, and showed Bob and Lili.

Bob: Wow, Sheila got her BS and BA in biochemistry and drama
Me: Really? That's cool.
Lili: Where is drama?
Bob: What?
Lili: Drama?
Bob: Yeah, like acting
Lili: But her degree...it is biochemistry?
Bob: Yes, she got 2 degrees
Lili: But...how that combine?
Bob: She had 2 majors and got 2 degrees
Lili: That make no sense