Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

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

I can write cow in 13 letters.

Can You?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

If you had an infinite supply of water and 5-quart and 3-quart pails, how would you measure exactly 4 quarts? What is the least number of steps you need?