What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

If a wheel has 54 spokes, how many spaces are there between the spokes?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

The Little ant seems to be always confused. Do you know why?

Different lights make me strange by changing me into different sizes. What am I?

What have one eye but still cannot see?