Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

How many times in a given day, minutes and hour clock comes in a straight line ?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

What always comes into a house through the keyhole?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?