Imponderables, or Mysteries of Everyday Life Explained, is a series of illustrated reference books by David Feldman written in FAQ format.
The books examine, investigate, and explain common, yet puzzling phenomena.
The word "imponderable" is used to describe such mysteries of everyday life.
Additional chapters explore Frustables, defined as Imponderables that are uniquely frustrating because they lack a clear answer.
In 1989, Feldman explored a number of idiosyncratic features of the English language in Who Put the Butter in Butterfly?.