What brings you down but never up?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

Which point will the car reach to go out?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

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?

I have no life, but I can die. What am I?

Can you find the missing piece of the Porsche?

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

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Why is a river so rich ?