The pentaquark is described as a doublet of states: P0=|c̄suud〉 and P=|c̄sddu〉. The H dibaryon is described as: H=|uuddss〉. Both were predicted to be stable against strong decay or slightly unbound resonances. The considerations leading to these expectations are reviewed. The main properties of these particles: masses, decay modes, lifetimes and hadroproduction cross sections are discussed. Experimental efforts to search for these particles are reviewed.

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