It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

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

People put me on the table and cut me but do not eat me. What am I?

What does a man do only once in his lifetime, but women do once a year after they are 29?

Find the last number in the series below:

voN luJ yaM raM ---

What 5-letter word typed in all capital letters can be read the same upside down?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

I travel all around the world but always stay in the corner. What am I?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?