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What is Common Sense?

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Common sense is a perception, understanding or judgement that can be agreed upon by an overwhelming majority of people without the need for debate. The following are illustrative examples.
Look before you leap.
Think before you act.
Wash your hands before eating.
Don't text and drive.
Don't leave candles unattended.
Check expiration dates on food.
Don't share sensitive information online.
Don't touch wet paint.
Let people get off a train before you get in.
The Earth orbits the sun.
The planet Earth is round, i.e. approximately spherical.
Try to be quiet in a library.
Be respectful and considerate of others.
If you do something wrong, apologize
The Sun is the closest star to Earth.
Humans need to breathe to survive.
The human body is made up of cells.
Thoughts originate in the brain.
The surface of planet Earth is mostly covered in water.
Animals can think.
Rocks probably can’t think.
People have rights and freedoms.
Nature has value.
People have value.
The three types of common sense are norms, principles and basic facts upon which most people will agree.
Common sense is cultural and isn't necessarily universal. For example, in many cultures it is common sense that you not wear shoes in the house but in others this is perfectly acceptable.
The concept of common sense has a long academic history beginning with ancient philosophy. The term is often used in an attempt to establish authority for one's ideas in suggesting that they are self evident. In some cases, the term has also been used with negative connotations to denote irrational conformity or superstition.
Overview: Common Sense
Function
Definition
A perception, understanding or judgement than most people would accept without debate.
Value
Judging the truth of something based on a widespread perception.
Related Techniques
Next: Examples of Facts

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