Cristina was born in 1888. She just had her 30th birthday today how did that happen?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

What has hands, but can’t clap?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

You can see it everyday, But cannot touch it at will. What is it?

What breaks yet never falls, and what falls yet never breaks?

No matter how little or how much you use me, you change me every month. What am I?

You enter your friend's room. He is not in his room. Although you see that on the bed there are two dogs, five cats, two giraffes and three pigs. Also, a couple of chickens and ducks are flying in the room.

Calculate the number of legs standing on the floor.

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?