What always comes into a house through the keyhole?

If you say my name, I will no longer exist. What am I?

What number when divided in half becomes zero?

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?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

The Little ant seems to be always confused. Do you know why?

Which Travels Faster? Solve below famous picture riddle:

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Some friends went on a vacation to a resort. It was raining heavily and it kept raining for thirteen days.

When it rained in the morning, the afternoon was beautiful and when it rained in the afternoon, the day was blessed with a clear morning.

Overall, the friends experienced eleven nice mornings and twelve nice afternoons. Can you find out the number of days they spent on vacation?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.