When it's bad luck to meet a black cat?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

There are three Athletes (John, Tarun and Harish) and their individual Coaches (Jacob, Meenaxi and Priyanka) standing on the shore.
No Coach trusts their Athlete to be near any other Coach unless they are also with them.
There is a boat that can hold a maximum of two persons.
How can the six people get across the river?

The more it dries, the wetter it becomes. Can you tell what it is?

Which is faster, Heat or Cold ? Explain.

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

If you say my name, I will no longer exist. What am I?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

why number 8549176320 is one of a kind?