What number when divided in half becomes zero?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

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

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

Find the Goldfish below the given Image.

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

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.

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?