There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

When is the top of a mountain similar to a savings account?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

How do you go from 98 to 720 using just one letter?

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

Find the last number in the series below:

voN luJ yaM raM ---

What is the centre of gravity?

Can you place six X (crosses) in below board without making three in a row in any way ?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?