In which direction should the missing arrow point?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

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?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?