What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

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?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

Move four matchsticks to the below square to form three squares?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

Can you find out who is the kidnapper in below Picture and why, Explain ?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A charming young lady was approached by a kind looking old woman in a restaurant. The old woman said to her, 'You look exactly like my younger daughter. Sadly she passed away a couple of months back. Could you do me a favor and say 'Goodbye, mother' with a kind smile on your face when I leave?

The young lady agreed for the same and said, 'Goodbye, mother' when the old woman left. Soon after, she got the most disengaging shock of her life.

Can you guess what the shock was?