Complete the table series riddle by finding the number that can replace "??".

During which month do people sleep the least?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

It is always ahead of me yet I can never see it. What is it?

One day, all the courtiers from Akbar's court were gathered in the assembly hall when one of them told the Emperor that all his valuables had been stolen by a thief the previous night.
This shocked the Emperor to his core as the place where that courter stayed was the most secured in the kingdom. The Emperor thought that it is not at all possible for an outsider to enter into the courtier's house and steal the valuables. Only another courtier could commit this crime. He quickly called Birbal to identify the thief.
Birbal thought for a while and successfully solved the mystery by identifying the thief in just one statement.
What did Birbal say?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

How many triangles are there on the puzzle below?

I add 5 to 9 and get 2. The answer is correct, so what am I?

Why 1729 is a magic number? Answer Logically.