What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

If 21x = 79x, what is the value of x?

why number 8549176320 is one of a kind?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

During which month do people sleep the least?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?