The other day, when I talked with my wife, she said

"I first saw a man (Ebata) who used the word "irrationality" or" cost "in daily conversation"

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For example, when my wife's mother went to our house and stayed, I heard that she was hesitant to take a bath before me. However I could not understand her behavioral principle.

At that time, I remember saying like "Heat energy is wasted (hot water has cooled down), it is irrationality"

However, the idea that the fact that "taking a bath ahead" than a family head, is not irrationality, even if the idea becomes old.

Especially, in a state where she does not know whether I am "a person" who cares the fact, such behavior can be said to be "rational".

In addition, once I get angry, I will continue to fight until the opponent or I fall down. This is the ultimate "irrational" behavior.

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Here, it does not matter whether "I am a reasonable person" or not,

It is that "I am a person who normally uses the term of "rationality" or "irrationality" in daily conversation.

"Well, the serif including 'rational' and 'irrational' unusual doesn't it"

I was impressed with my wife's opinion.

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However, in my workplace (laboratory), the words "rationality", "irrationality", "cost", "profit", "damage" and "interest" are commonly used words.

I strongly recommend that a person who is date with a researcher, or married to a researcher, might raise or lower the level of "common sense" a little.

Researchers have no intention to be intellectual, and no malice, of course.