Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

Why do we preferably have round manhole covers and not square ones?

Identify Me

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

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

What work can one never finish?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?