There is a round estimate of 2.2 billion kids in this world according to globalissues, and according to hellemanworld.blogspot about 39% people in this world are Christians. This means that there are 858 million Christian kids in this world. Theoretically speaking, Santa would travel east to west, so he has 31 hours to distribute presents. This means he has 1860 hours or 6696000 seconds to deliver presents to kids. Let's say four kids live in a house. This means there are about 83,650,000 houses. We are going to assume that there is at least 1 good Christian kid in the house. After all, aren't Christians supposed to be good? Santa must be able to go to 12 1/2 houses in one second. Theoretically speaking, that is impossible. He will have to get out of his sleigh, grab the presents, go down the chimney, place the presents, and eat the cookies all in .08 seconds. That is impossible.
I do not believe that Santa exists, but I do like the idea of Santa existing. If kids believe that Santa exists, they will not mess around and be rude to one another; instead, they will be very nice and polite. It is a cycle if little kids believe in Santa. They will be nice, they get presents. If they are mean and rude, they won't get presents.

The first phase in DNA replication is interphase. During interphase nothing is happening. The cell is getting ready to start to replicate. The second stage is prophase, during prophase DNA copies itself. The phase after that is metaphase. During metaphase, the DNA is lined up and is getting ready to split apart. The next phase is anaphase. During anaphase the DNA is split up, and now the two new nuclei began to form. The two cells begin too pinch inwards to split apart. Now mitosis is complete.

DNA is shaped like a twisted ladder, another way of thinking of it is as a double helix. DNA contains base pair. base pairs can also be called nucleotides. The sides are built of deoxyribose sugar and phosphate group. There are 4 base pairs that determine your genes. These 4 base pairs are adenine, thymine, cytosine, and guanine. Thymine and adenine go together, and cytosine and guanine go together. The base pairs will look rungs on a twisted ladder. You may be thinking that there are only 2 possible ways and that you and I look like half the world, but no; that's not how it works. These base pairs work together, and they determine each and everyone of your genes. We have about 90000 genes. There  is a very low chance that anybody in this world who looks and thinks exactly like you.