What is the longest word in the dictionary?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

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.

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

A bomb exploded in a room full of married couples and no one died. How?