Define ordinary expert?
ordinary
out of the ordinary
Belonging to the world; ordinary.
An expert or specialist in psychology.
ordinary business expenses
BORED
Mediocrity is the state of being ordinary or average.
expert opinions about matter and energy
Ordinary matter is anything that has mass and volume, but the ever advancing field of quantum mechanics is changing this definition.
a person who has special skill or knowledge in some particular field
using famous person or an expert
Definition of a Hero: Ordinary person who commits an extra-ordinary act under extra-ordinary circumstances. (ie; someone who runs into a burning building to save somebody else's life is a hero).