KnowldegeNUCLEAR INTERACTIONS OF STOPPED M-MESONS, EXPERIMENNTAL DATA ON THE HEAVY UNSTABLE PARTICLES, THE PENETRATING COMPONENT OF COSMIC RADIATION IN THE UPPER ATOMOSPHERE, THE DEVELOPMENT OF A NUCLEON CASCADE, ONE DIMENSIONAL DEVELOPMENT OF NUCLEON CASCADE, THE ANGULAR DISTRIBUTION OF SCATTERED NUCLEONS IN HIGH ENERGY NUCLEAR COLLISION, RANGE-ENERGY RELATION, GRAIN COUNTING, Prticle identification WITH PHOTOGRAPH EMULSIONNS AND RELATED PROBLEMS