Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?

What can you catch but never throw?

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.