Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Can it be possible to build a house that has all its four walls facing towards the South?

What jumps when it walks and sits when it stands?

What English word has three consecutive double letters?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

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?