To start, I am making my argument from the point of view that everything Santa does is physically possible. I will start with the issue of time. When, as brought up in one of the rebuttal articles, Santa's reindeer are fed the magic corn and the ability to fly passes down as a dominant trait, I have my own expansion theory on the subject. I believe that because of its magic, the trait did not only stay of the same power, but it increases exponentially from generation to generation. So the starting speed of flying reindeer would have been their normal 15 mph, then up to 225 mph the next generation and so on. I also must make a point that there is no reason to assume of the recency of Santa's exploits, and that the filmmaker simply redistributed the events in a later time period, for more connectivity with the audience. This means that Santa's reindeer have had an indefinite time span to allow the magic feed to grow in their systems. They would eventually be able to travel the speed of light, and faster. This would have a stopping, or backwards effect on the time/space continuum, as theorized by many scientists. Santa and his reindeer would have ample time for the trip.

Because of the built up magic feed, I feel that the huge amount of energy has supercharged the electrical auras that surround each reindeer. Auras are the electromagnetic fields that surround every living thing. The supercharged electricity would have no place to go, but into Santa's aura, who is such close contact with the reindeer, and of course, Mrs. Claus, who "tends the reindeer and their sleigh," as according to the popular Christmas song. The extra energy would increase the reindeer's wind protection, that they would have evolved into after generations for flying. The energy would saturate Santa and the sleigh with protection, because of their close and continued proximity to the reindeer. This would, of course, also extend their life span beyond their usual, and up their metabolism, which would take care of most of the multitude of calories, but not all. To address that problem, we first have to address another.

Even with the built up power of the reindeer, the huge amount of mass on the sleigh would quickly unbalance and all of the toys fall into the ocean. To solve that, Santa would have to engineer a teleporter. The physics of teleportation are very simple in theory and explanation. First, one would have to develop a type of scanner that would be able to memorize all of the molecules and patterns in an object. Then one would have to break away all of the bonds holding the molecules in a solid state, and transmit them like a light wave. The human light wave could then be bounced off of orbiting satellites and received by another machine in Santa's bag. The receiving machine would have to be able to reform the molecules and recreate the bonds. It would also have the scan taken at the beginning to use as a reference. While there is no telling if a living thing could survive such an experience, it is reasonable to assume that a present could.

Santa could also use this teleportation network to send milk and cookies back to his base at the North Pole and pay the elves with them, save them for late, or give them to Mrs. Claus. He would also, of course, eat a great many of them, and feed the reindeer, who unlike dogs, probably can be given chocolate. He would then have an average sleigh weight, which would be kept up right by the speed of the reindeer. Santa could use a teleportation unit, like the one in the bag, but with a fan, long-range reformer, no reception unit, and a high powered vacuum to get him back up.

If there is anything else you doubt about Santa, I will be happy to share or make up a theory to counter your dark thoughts.
When DNA replicates, the first thing that happens is that the bonds that hold the bases break apart, leaving two strands of nucleotides. Nucleotides consist of a base, deoxyribose sugar, and phosphate.  Because certain bases bond with certain bases, the cell can produce new nucleotides that will follow Chargaff's rules. The bases are then bonded together in their pairs (adenine with thymine, and cytosine with guanine). The DNA has then replicated into two identical strands. DNA is shaped as a double helix, with the phosphate groups (a sugar and phosphate) on the outside, and the base pairs going across the inside. When the bonds break apart, helix separates into two inverse strands of the DNA.

For If the bases in one separated strand was AAGTCGGACGTCT, then the inverse, matching strand would be TTCAGCCTGCAGA. After the new bases are created, these strands would both be paired with their matching inverse strands.
The structure of DNA is composed up of base pairs, deoxyribose sugar, and phosphate. Each pair is either adenine with thymine (A with T) or guanine with cytosine, (G with C). DNA is shaped in the for of a double helix, or a twisted ladder. The outer part of the helix is made up of phosphate groups, which consist of deoxyribose sugar and phosphate. Then, going across the helix is a base pair. The paired bases simply join together across the gap between the strands of phosphate groups. Each phosphate group and base is a nucleotide. DNA is composed of various such nucleotides that twist in the form of a double helix.

DNA replicates by splitting from a double helix into two separate single helices. New nucleotides then form in the correct base pairs and make two new double helices.