IDEA and ISAAC are acronyms of private establishments. "Femto" is a combining form used in the names of units of measure that are one quadrillionth (10 to minus 15) the size of the unit denoted by the base word. Thus, the word femto-essays is used here for the name of very short essays. (Links to book titles and the Amazon shop are made as an Amazon Associate, and I earn from qualifying purchases.) Copyright © 1999-2023 by Tatsuo Tabata