Count the squares in the matchstick puzzle below?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

How many sides does a circle have?

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

You need to move three matchsticks to form three squares. Can you do it?

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

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

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