Why do people go to bed?

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?

There is a circular car race track of 10km. There are two cars, Car A and Car B. And they are at the exact opposite end to each other. At Time T(0), Both cars move toward each other at a constant speed of 100 m/seconds. As we know both cars are at the same speed they will always be the exact opposite to each other.
Note, at the center, there is a bug which starts flying towards Car A at time T(0). When the bug reaches car B, it turns back and starts moving towards the car A. The speed of bug is 1m/second. After 5 hours all three stop moving.
What is the total distance covered by the bug?

Who is that with a neck and no head, two arms and no hands? What is it?

What is the riddle which can be asked all day with a different correct answer each time.

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Shyla was sleeping in her apartment when suddenly a robber broke into her house. He asked her to stay quiet and started looting the cash and jewelry. Suddenly the landline phone started ringing. The robber pointed a gun at Shyla and asked her to pick up and talk without giving away the situation.

She picked up the phone and it happened to be her husband. She spoke, Is it an emergency darling? Do give me a call when your flight lands, I will prepare your favorite food that will help you relieve the stress. Then she hanged up.

10 minutes after, the police arrive at the scene and catch the robber. How did the police know about the robbery?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

With the help clues provided in the image, can you find the 5 digit key?