13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

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

John is the son of Jacob.
So,
Jacob is the_____of John's father?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

81 x 9 = 801. What must you do to make the this equation true?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What 5-letter word typed in all capital letters can be read the same upside down?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?