Also to add to me, Reed embraces science to explore and experience all that the universe has to offer, Tony embraces science to build tangible products for the betterment of his peers, and Hank embraces science simply for the joy of science itself. He's the most purely "scientific" of them, since science isn't just a means to an end for him, even though he may not be as smart as Reed or Tony (although I personally think he's totally smarter than Tony). Yeah, I'm not gonna say that Tony might not have a greater capacity for learning or a higher IQ, but he's stuck to his field while Hank has branched out into all kinds of different sciences and had major breakthroughs in biology (Pym Particles) and robotics (Ultron, a fully sentient artificial intelligence) and now spatial physics (Pym Pockets). Hank's got more scientific knowledge rattling around in his brain than Tony, at least.