My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

What has many teeth, but cannot bite?

John is found dead in his office at his desk. The police have narrowed the suspects down to three people: Mrs. Jacob, John’s wife Hena and his business partner Jason . All three visited John on the day of his murder, but all three provide the police with stories of explanation as to the reason for their visit.
Police found John with his wrist watch still on his right arm, a torn up picture of his wife laying on the floor beside the trash can, and an ink pen in his right hand. On the desk, the police found a name plate, a telephone that was off the hook, and a personal calendar turned to the July 5th page with 7B91011 written on it. After examining this evidence, the police knew their suspect. Who was it ?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

You need to move three matchsticks to form three squares. Can you do it?

Using eight eights and addition only, can you make 1000?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.