Mathematicians Crack 125-Year-Old Problem, Unite Three Physics TheoriesA breakthrough in Hilbert’s sixth problem is a major step in grounding physics in mathMathematicians suggest they have figured out how to unify three physical theories that explain the motion of fluids. Floriana/Getty ImagesWhen the greatest mathematician alive unveils a vision for the next century of research, the math world takes note. That’s exactly what happened in 1900 at the International Congress of Mathematicians at S...