ABSTRACT
The concept of strangeness and its conservation in strong interactions has led to a large number of predictions, none of which have been violated by experience. It has served very faithfully to help organize the experimental material. These predictions are, for example, that when a Λ or Σ is produced in nuclear collisions, a K° or K+ must be also. Again, a production reaction such as n + n → Λ + Λ is impossible for the total strangeness of the two Λ’s is −2, and of the neutrons 0.
