In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

People put me on the table and cut me but do not eat me. What am I?

How can you take 2 from 5 and leave 4?

What's a single-digit number with no value?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

If an electric train is travelling south, then which way is the smoke going?

How far can you walk into the woods?