Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

I have branches, but no fruit, trunk or leaves. What am I?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

What do you call a fish without an eye?

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

What Adam and Eve do not have but the rest of the people have?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?