What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

What's the only room from which no one can enter or leave

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

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?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

What question can you never answer yes to?