Why Aeroplane windows are round?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

I know a nine-letter word having only one vowel.
Do you ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

This was asked in an interview with Coa-Cola.

The interviewer has given me 100 marbles(50 white and 50 black) and two empty boxes.
He then told me that he will leave the room and i need to place all the marbles in two boxes.

And When he come back, he will draw a marble from any of the two box and if the marble is white I will be hired.

Also
* No box can be empty.
* All 100 marbles must be placed in one of the two boxes.

So what should I have done?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?