Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

What is the end of everything?

What can you hold in your right hand, but never in your left hand?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

With the help clues provided in the image, can you find the 5 digit key?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Client Dempsey living in one of the East Coast states of the U.S. was talking to Landon Donovan, who was living in the West Coast state of the U.S.

Dempsey: What time is it?
Donovan: Wow, It is the same time here.

How is this possible?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?