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

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

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

A father's child, a mother's child, yet no one's son.

Who am I?

Which is the correct shadow of the bird?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Can you count the number of blocks in the picture below?

What does an Island and the letter T have in common?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

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