What question can you never answer yes to?

Find the next number in the series below

21 32 54 87 131 ?

A dead body is found outside a multi-story multinational company. The case is reported and a homicide detective is called on the crime scene.

He looks at the body and then towards the building. From the position of the body, it is evident that the victim committed suicide. He goes to the first floor of the building and then walks in the direction of the dead body, opens the window and toss a coin in the air.

He goes to second floor and again repeats the process. He keeps doing this till he is done on all the floors. Then he returns back to the floor and tells his team that it is a murder.

How in heaven did he deduce that?

Using eight eights and addition only, can you make 1000?

What is the difference between a jeweller and a jailer?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

What is full of holes but still holds water?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

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

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