The dirtier I get, the whiter I look. Who am I?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

How many times can you subtract the number 5 from 25?

What occurs twice in a week, once in a year but never in a day?

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

There were two grandmothers and their two granddaughters.
There were two husbands and their two wives.
There were two fathers and their two daughters.
There were two mothers and their two sons.
There were two maidens and their two mothers.
There were two sisters and their two brothers.
Yet there are only six, who are buried here,
All are born legitimate and relationships clear.
How can this happen?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

I don't get anymore wetter, no matter how much rain falls on me.

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?

Why do people go to bed?