Explanation

"Fooling number" (likely a misheard or informal term for Filing or Folio number) is used to track or identify office files.

It helps in maintaining proper record and retrieval of documents.

Explanation

Ex-Officio means a person holds a position automatically due to another role they already have.

Example: A minister may be the Ex-Officio head of a committee because of their office.

Explanation

A D.O. file stands for Demi Official file, used for correspondence between senior officers.

It carries a personal touch but is still semi-formal and official in nature.

Explanation

Herodotus' account of the Greco-Persian Wars was the only book he ever wrote.

The Histories, which is the oldest history book in Western civilization.

It was completed around 425 B.C.

He took the title from the Greek word ''historie,'' which means ''inquiry.