13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

What is so fragile that saying its name breaks it?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

What is the next shape from answers A, B, C, and D figure?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

A bomb exploded in a room full of married couples and no one died. How?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?