Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

What can you serve, but never eat?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Move three sticks of the spiral below to form a square.

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?