The only thing âpositiveâ about a Gentle Leader is that you use clickers and food to bribe the dog to let you put it on. They hate it. Gentle Leader or medieval torture device? What is more cruelâa prong collar or a Gentle Leader? A lot of people will point to the prong collar, mainly because they arenât educated in how they work. And after all, a Gentle Leader is â¦. gentle. But donât let the soft straps and cheerful colors fool you. Head halters are far more aversive than a prong collar.
Definition. 1  A Permissible Exposure Limit (PEL) is the maximum amount or concentration of a chemical that a worker may be exposed to under OSHA regulations. 2  A Time-Weighted Average (TWA) is explained below. 3  A VPEL or Vacated PEL is an older PEL set by OSHA but later vacated (retracted) under court order.
Adorable animal families that will make you aww. ESL stands for English as a Second Language, and generally English Language Learners (ELLs) are those people for whom English is not their primary language. ESL teachers work with ELLs to help them acquire fluency in English, both spoken and written. These teachers normally have special training in the field.