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Transverse velocity gradients develop in both fluids , and these serve as a source of free energy that feeds perturbations at the interface , causing them to grow . all of these ( and all the other commercials that work so well on us ) succeed because they get deep inside us , bypassing our rational brain and triggering our feelings . The demand for refurbishment of these East European systems is huge . Many top American scientists reject these rosier numbers . Because , in laboratory terms , the chemical you are doing the analysis for is called the " analyte , ' these active ingredients are referred to as " analyte specific reagents " ( ASRs ) .