There was an aeroplane crash, every single person died, but two people survived. How is this possible?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

There is something which is always coming but never arrives?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Can you make four (4) nines (9) equal 100?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?