Why 1729 is a magic number? Answer Logically.

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

By using 'because' continuously three times, can you make an English statement ?

Forwards I am heavy, backward I am not. What am I?

Count the number of triangles in the below picture?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

Count the number of lines in the image below ?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

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