Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

People put me on the table and cut me but do not eat me. What am I?

How many triangles are there on the puzzle below?

When it is alive we sing, when it is dead we clap our hands. What is it?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

What is the word or phrase below?
R | E | A | D

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

Can you find out a way through which you can make five squares out of the given figure by moving just six match sticks?