Abstract: Around 15 years ago Alexei Kitaev devised an exactly solvable model consisting of spin ½ particles on a honeycomb lattice with competing bond-directional dependent interactions . The ground state of this model is a quantum spin liquid, and the excited states include Majorana fermions that could be utilized for topologically protected quantum computing. Subsequently it was shown that the terms in Kitaev’s Hamiltonian might be realized in practice , giving rise to a new area of research dubbed “Kitaev Materials” . For several years now α-RuCl3 has been one of the most widely studied examples. This talk will include a brief discussion of collective excitations in quantum magnets and their relationship to elementary particles. After introducing the Kitaev model mentioned above it will specialize to what is known about α-RuCl3 and its excitations, with some emphasis on neutron inelastic scattering measurements . If time permits I will also give an update on a raging controversy surrounding reported observations of the quantized thermal Hall effect in α-RuCl3 . Such an effect was predicted to arise from magnetic Majorana fermions in the Kitaev quantum spin liquid.