Downplayed: Archibald is a surgeon, while Flora is a historian.
Justified: Archie was raised by strict parents who encouraged him to excel in school but were dismissive of his emotional needs. Flora grew up in a family that was very close and loving, but rather anti-intellectual.
Inverted: Archibald is a gentle and kind gardener who just can't deal with his emotions. Flora is a cold and heartless bitch of a physicist who can figure out just about anything in her field of expertise.
Zig Zagged: Archie has random bouts of consideration, selflessness, and appreciation of beauty, while Flora occasionally manages to calm down and solve a problem with truly brilliant reasoning.
Archie and Flora are people with no special inclination towards science and neither is especially over-emotional.
Alternatively, they are both good at science and work in the same discipline, in addition to being good and compassionate people. The story also explores the idea of the supposed "conflict" between nature and science, and concludes that the conflict is an imaginary one, since science is, in fact, the study of nature.
Lampshaded: "Well, of course Archie is brilliant but a selfish asshole, and of course Flora is a sweet girl but impossible to reason with when she gets hysterical. He's a man and she's a woman, after all."
Defied: Childhood friends Archie and Flora make a pact that they don't care if boys are supposed to be better at science and girls are supposed to be better at emotional stuff — Archie's going to become a kindergarten teacher, and Flora will be a great inventor.
Discussed: "Don't you find it strange that it's still considered socially unacceptable for a woman to act rationally and for a man to care about other people?"
Deconstructed: We're shown how Archie, growing up, was taught to ruthlessly repress his emotions and value only hard logic because that's what a Real Man does, gradually becoming cunning, cold, and heartless. Flora, meanwhile, was told that she shouldn't bother studying science or math because girls aren't good at that stuff, and learned that since no one respected her thoughts, the only way to get people to listen to her was to become hysterical. As a result, both of them end up as bitter, miserable and thoroughly unlikeable adults.
Reconstructed: Archie is brilliant, but sometimes loses sight of emotional issues in his zeal for logic. Flora is empathetic and kind, but often finds it hard to take action or think things through calmly because she's so easily overwhelmed by her emotions. Together, though, they balance out each other's flaws and become a great team.