Task: Text Categorization
Input (English): Couette shear cells can be used to study cube, sponge, and laminar transitions of solutions of this type of substance. CTAB, an example of this substance, is used to make genomic preps from Arabidopsis, and type II alveolar cells secrete this type of substance. They can be used to increase the miscibility of other substances, and some common laboratory examples include Igepal and sodium dodecyl sulfate. For ten points, name this class of compounds that lower the surface tension of a liquid, whose name is a portmanteau of "surface-acting agent".
Output (English): Science