Atoms may be composed of electrons orbiting a hypernucleus that includes strange particles called hyperons. This characteristic was established through the measurement of the spins and parities of many hyperons. Being baryons, all hyperons are fermions. They created some short-lived resonance "particles", but also "hyperons" and "K-mesons" with unusually long lifetime. Hyperons all interact via the strong nuclear force, making them types of hadron. Hyperons decay weakly with non-conserved parity. The undergoes quasi-elastic scattering with nucleons, whereas its antiparticle can create hyperons.