Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

I shave every day, but my beard stays the same. What am I?

Move four matchsticks to the below square to form three squares?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

I have eight fingers and two thumbs but I do not live. What Am I?

Can you count the number of blocks in the picture below?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?