1. It's logically possible that 2 + 2 = 5
2. Is is logically possible for Fidel Castro to become president of the United States in 1959?
3. It's logically possible for a deductive argument to have true premises and a false conclusion.
4. It's causally possible to travel back in time.
5. Is it causally possible for two parallel lines to meet at an infinite point?
6. Is having four sides in a square logically necessary?
7. It's not causally possible for an animal that lacks a vertebral column (or backbone) to be a vertebrate.
8. Here's a problem sample:
It's probably true that whenever (A) a baby is born, (B) someone somewhere in the world will die on the same day. But this is hardly surprising given the number of people dying and being born each day. Any connection between the two is purely an accident.
In order to understand if the connection between A and B is an accident, it is essential to consider a counterexample. Can you think of that counterexample?
9. Is it causally possible for a father not to be a parent?
10. Is the presence of oxygen causally necessary for the proper functioning of the brain?
11. Being an adult of over 18 years old is legally sufficient for having the right to vote.
12. The presence of a witness is legally necessary for a valid marriage.
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