‘Exotic nuclei’ discusses halo nuclei, borromean nuclei, hypernuclei, strange matter, and antimatter. Unstable isotopes with a larger excess of neutrons, or an excess of protons may form halos around a central core—halo nuclei or borromean structures, which have short half-lives, typically of the order of milliseconds. If a quark in a neutron or proton is replaced by a strange quark, the resulting particle carries the property of strangeness, and is generically known as a ‘hyperon’. A hypernucleus is formed when a hyperon replaces a nucleon within a nucleus. Antimatter exists in quantum theory, but there seems no evidence that it occurs in practice in the observable universe.