Find the next number in the sequence

1, 2, 6, 21, 88, __?

What will you call your mother's brother's brother-in-law?

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

Why do you find that most of the buildings are deprived of the 13th floor?

What is the next number?

77, 49, 36, 18 ?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

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

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

You can see three almost identical images below. Can you spot the odd one out from them?

What seven-letter word has hundreds of letters in it?