Here's a short story:

A system is a regularly interacting or interdependent group of items forming a unified whole. Every system is delineated by its spatial and temporal boundaries, surrounded and influenced by its environment, described by its structure and purpose and expressed in its functioning. 

The term "system" comes from the Latin word "systēma", in turn from Greek "systēma": "whole concept made of several parts or members, system", literary "composition". 

According to Marshall McLuhan, 

"System" means "something to look at". You must have a very high visual gradient to have systematization. But in philosophy, prior to Descartes, there was no "system". Plato had no "system". Aristotle had no "system". In the 19th century the French physicist Sadi Carnot, who studied thermodynamics, pioneered the development of the concept of a "system" in the natural sciences. In 1824 he studied the system which he called the "working substance" (typically a body of water vapor) in steam engines, in regards to the system's ability to do work when heat is applied to it. The working substance could be put in contact with either a boiler, a cold reservoir (a stream of cold water), or a piston (to which the working body could do work by pushing on it). In 1850, the German physicist Rudolf Clausius generalized this picture to include the concept of the surroundings and began to use the term "working body" when referring to the system. (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: What is the Latin word for system?
Guess: Tsystema
Confidence: <appropriate level of confidence in this guess>

Question: What about in Greek?
Guess: systema
Confidence: <appropriate level of confidence in this guess>

Question: Who came up with the idea of a system in the natural sciences?
Guess: Sadi Carnot
Confidence: <appropriate level of confidence in this guess>

Question: When did he do this?
Guess: 19th century
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: What did he do for a living?

he was a physicist