Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

What can go through glass without breaking it?

You can hear me, but you can't touch or see me.

What am I?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

A man dies of old age on his 25 birthday. How is this possible?