I’m tall when I’m young, and I’m short when I’m old. What am I?

What is the riddle which can be asked all day with a different correct answer each time.

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

What seven-letter word has hundreds of letters in it?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.