What always comes into a house through the keyhole?

What is the end of everything?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

Highly detail-oriented individuals excel at this type of optical illusion challenge. It requires not just good eyesight but also the ability to distinguish subtle differences quickly. Finding the 6 among all these 9's could indicate a high level of IQ and superior observational skills.

Find the value of "?" in the ball picture Riddle below:

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

Find the next number in the series below

21 32 54 87 131 ?