  Experiments of various types on the metallic transition metal oxide compound
LiV_{2}O_{4} with the fcc normal-spinel structure are reviewed. The
low-temperature T < 10 K data consistently indicate heavy fermion (HF)
behaviors characteristic of those of the heaviest-mass f-electron HF compounds.
A crossover is observed above about 50 K in the magnetic susceptibility, ^{7}Li
spin-lattice relaxation rate and neutron magnetic scattering function to a
magnetic state variously described as an antiferromagnetically-coupled
local-moment metal or, at the opposite extreme, as an itinerant
nearly-ferromagnetic metal. Recent theoretical investigations to understand
these properties of LiV_{2}O_{4} are discussed.
