In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: This quantity is the ratio between the mass of the electron neutrino and the mass of the muon neutrino. Andre Geims work suggests that the most exact value of this is equal to the amount of light absorbed by graphene divide by pi. The square of this is equal to the ratio of the rest mass of the electron and the Hartree energy, and many scientists have proposed studying the 21 centimeter line of the CMB to study the change over time of this quantity. The best estimate for it was obtained by considering the magnetic moment of an electron, and the Quantum Hall Effect has also been used to calculate its value. First proposed to account for the splitting of the spectral lines of the Hydrogen atom and famously miscalculated by Eddington, for 10 points, identify this constant approximately equal to 1 over 137.
A:
Science