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For example , the concept of “ mass ” may be non-definable in a theory dealing only with single orbits of a mechanical system , but definable in a theory containing all possible orbits of that system . Often during extended periods of drought and hot weather , soil salinity may become a problem . And did you know that you can rid plants of insect pests or fertilize the soil in which they grow simply by exposing pictures of the growing plants to particular frequencies of electromagnetic radiation ? Dr. Alter has published articles on aspects of the North Indian Classical tradition as well as on aspects of musical practice in Garhwal . Programmes performance is expected to be restrained by low export activity and with production programmes still in early phases of maturity .