  Searching for and charactering the non-Gaussianity (NG) of a given field has
been a vital task in many fields of science, because we expect the consequences
of different physical processes to carry different statistical properties. Here
we propose a new general method of extracting non-Gaussian features in a given
field, and then use simulated cosmic microwave background (CMB) as an example
to demonstrate its power. In particular, we show its capability of detecting
cosmic strings.
