Hidden Assumptions

We are always making assumptions.

When we go to the train station we assume that there will be a train coming soon.

Unless we learn something to challenge our assumption, we accept the assumption without thinking about it.

But, we are aware that we are making this assumption.


What assumptions have you made already today?

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We are often making assumptions that we don`t even know we are making.

These are hidden assumptions.


Look at this argument.

Nuclear Power is wrong because it is unnatural!

The hidden assumption is "If something is unnatural, it is wrong."


All arguments have at least one assumption.


Find the hidden assumptions

1) Moby Dick is a whale. So Moby Dick is a mammal.

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2) Giving students a failing grade will damage their self-confidence. Therefore, we should not fail students.

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3) It should not be illegal for adults to smoke pot. After all, it does not harm anyone.

Assumption_____________________________________________________

4) There is nothing wrong talking on a mobile phone during lectures. Other students do it all the time.

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5) Killing an innocent person is wrong. Therefore, abortion is wrong.

Assumption_____________________________________________________

6) Traces of ammonia have been found in Mars' atmosphere. So there must be life on Mars.

Assumption_____________________________________________________