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

There is a place where if I stand up straight, I will still be considered sideways.

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

I can write cow in 13 letters.

Can You?

What does below chemistry rebus means?

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

What is the next shape from answers A, B, C, and D figure?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?