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

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

A spy was in Canada trying to steal insider information on how to set up new Maple Syrup factories in their country. He was introduced to the operations manager of the biggest factory in Canada. However, the manager was suspicious and decided to test him with a question before he trusted him. So he asked, “What would you be sure to find in the middle of Toronto?” The spy thought fast and came up with an answer for the manager. What was his answer?

I have an eye but still cannot see.

Who am I?

What do you call a fish without an eye?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

There was a strange boy who was born before his father. How can this be possible?

What seven-letter word has hundreds of letters in it?