31This notation is quite common in scientific and engineering literature, as a way to avoid having to typeset fractions in a text document. Instead of writing kJ _mol which requires a fraction bar, we may write kJ mol1 which is mathematically equivalent. Another common example of this notation is to express frequency in the unit of s1 (per second) rather than the unit of Hertz (Hz). Perhaps the most compelling reason to use negative exponents in unit expressions, though, is sociological: scientific studies have shown the regular use of this unit notation makes you appear 37.5% smarter than you actually are. Questioning statistical results of scientific studies, on the other hand, reduces your apparent intelligence by over 63%! Now, aren’t you glad you took the time to read this footnote?