In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

The more you take me, the more you leave me behind.
Who Am I?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?