The cellular structure of Clark Kent is similar to that of a human. However, a certain chemical makeup in Kryptonian ribosomes (organelles responsible for protein synthesis) is capable of absorbing solar energy and storing it. Once the ribosomes achieve saturation levels of this radiation, they begin to re-radiate the energy in the form of a bioelectric forcefield. Each individual cell within the field's radius becomes reinforced in such a way that the cells are not only protected from external harm, but internal forces as well. It is this last which is key to Clark's great powers. Since the individual cells are wholly invulnerable, they are capable of operating at levels of efficiency that would destroy normal humanoid cells. These "super-cells" lend an enhancing effect to all bodily systems...muscular, metabolic, nervous, and so forth. The continual absorption of solar energy provides a constant power source for these enhanced systems. Thus, Clark is capable of incredible feats. Naturally, the basic forcefield effect renders him invulnerable to large amounts of damage. Unlike a human, Clark's body has more than simple cohesion and adhesion holding his tissues together. The bioelectric forcefield has a set tolerance for how much stress occurs before it reacts energetically in opposition to the external force. The tolerance for how much stress occurs before Superman's tissues counteract it varies according to tissue type. His bones allow virtually no compressional or tensional strain (deformation in shape) and his fleshy tissues remain supple under soft pressure, but under stress react to restrict any further deformation in shape. Since the strength of Clark's cellular forcefields greatly exceeds the cohesive force of any substance, no ordinary object can puncture his skin. When his solar energy is depleted, his resistance to physical punishment drops to approximately one-quarter the normal amount. Withstanding large amounts of damage continuously over time will rapidly deplete his solar reserves. Clark's cells provoke one another into releasing their respective energy when one begins to threaten the integrity of the other. Because of a certain degree of constant pressure, there is a continuously emitted radiance of the bioelectric field reaching slightly beyond his body, a sort of aura that protects items near his skin e.g. a skin tight costume. The aura also protects Clark's teeth, however his hair and nails are only partially protected due to certain cellular properties they possess. They are invulnerable to fire, however they can still be cut. Due to the highly charged nature of his solar storage systems, his immune system deals with most normal poisons and diseases quickly and with no ill effect. With the exception of kryptonite emissions, radiation and similar harmful energies are similarly neutralized. His physical strength is greatly magnified by the combination of his more-efficient muscular system and the enhancement of his skeletal system's structural integrity, but is primarily augmented by the sheer force of his solar forcefield. When Clark appears to be lifting a weight, he is actually holding and pushing it with the bioelectric field. His energy stores push not from himself, but from the shielding that surrounds him. So the shielding is controlled on the highest level and simulates strength. Continual exertion will deplete his solar energy, and greatly exceeding his normal lift will drain him more rapidly. Similarly, Clark's enhanced metabolic rate, muscular speed, and nervous system grant him incredible speed. His Kryptonian structure and the solar energy paths that course along his neurophysical structure allow him to react at many times normal human speed. He can move faster than the human eye can perceive if necessary, but this requires extra effort. His reflexes are quick enough to allow him to dodge incoming automatic laser fire. Clark's perceptions are similarly rapid, allowing him to see individual bullets fired from high-speed automatic weaponry in flight and outrace them easily. Moving at extreme speeds for extended periods of time rapidly drains his solar reserves. The enhanced structure of Clark's sensory organs combined with the increased capacity of his nervous system provides for the greatly enhanced senses. He can distinctly hear soft sounds anywhere on Earth if he is listening for them. His visual reception range covers the entirety of the electromagnetic spectrum. The difference between human and Clark's vision is that Clark has the capability to see a much wider band of the electromagnetic spectrum; while humans only sense a very narrow band of the spectrum we call visible light. Clark can change the spectrum he perceives at any given time, by changing the chemical receptors in the rods and cones of his retinas. He can adjust his photovoltaic detection as an act of will to sense longer wavelengths down to the infrared, and higher energy light, up to X-ray and gamma radiation. Kryptonian muscle tissue when super-charged with solar-energy, can generate a powerful gravitational field. Clark can use the gravitational fields generated by the muscles in his eyes to produce a gravity lens, allowing him to focus far beyond the range of the human eye. Combined with Clark's sensitivity to light, he can magnify an image a virtually countless number of times. Clark can see through solids objects by using a combination of these telescopic and microscopic visual abilities to see through the atomic structure of an object and focus past it, as a camera focuses beyond the dust on a lens. Certain dense materials, notably lead, obstruct this ability. Clark has the ability to expel stored (solar/electromagnetic) internal energy in the form of focused beams of radiation from his eyes. He emits light along various frequencies in high energy bursts that flash-melts materials in seconds, weaken structural integrity over a smaller area, such as melting the barrel of a gun but leaving the handle untouched. Clark can control his heat vision and direct it wherever he wants to. He directs it with his eyes. In actuality, Clark could not emit the beams directly from his eyes. The energy is actually built up on the surface of the bio-energetic field surrounding his body and emitted from there. This allows his body to be protected from the energy and absorbing stray electromagnetic energy back into his body. Clark's energy reclamation aura is so efficient that any radiation, even those emitted from him, once in the environment are able to be reabsorbed. The heat beams are psionically controlled and that control is reflexive, so he can shut it off without accidentally damaging anything that he does not want to. He can emit the radiation visibly or invisibly at lower settings. His energy has a high visibility profile if emitted at higher levels. Clark has the power to release gale-force winds from his lungs. He can create ice blocks from his breath, as well as freeze objects and opponents. The psionic portion of his powers are made evident by these depictions. The only way for objects to freeze is if their molecular composition slows down in motion at an incredible rate. The application of intense winds from Clark's breath is actually not sufficient to freeze things. Since Clark can agitate molecules to increase in motion, he can do the reverse. He is using the same effect that amplifies converted solar energy in reverse. He is using it as a catalyst to access higher-order energies through an unknown physical mechanism. That same amplification mechanism is reversed to dampen or neutralize energies in the environment to produce freeze breath. Additionally, his vast lung capacity is not physically possible given the dimensions of the humanoid physique. However, his "super-breath" includes tesseract-type properties. The fatal flaw in Clark's Kryptonian cellular physiology is the unique radiation given off by kryptonite. In the most minute amounts, the radiation waveforms and high-energy particles emitted by kryptonite can react catastrophically with the very ribosomal chemical that grants Clark powers. The briefest contact can strip these powers, and further begin a fatal poisoning that totally shuts down cellular activity in the affected areas. As kryptonite radiation makes its way through his bloodstream, Clark becomes instantly weak and ill in its unshielded presence, and prolonged exposure will render him or her unconscious, and will eventually reach all parts of his body and bring death, probably as his body's immune system attempts to expel the deadly toxin. However, the rate of recovery once removed from the emissions is as rapid as the rate of damage, and Clark will be back to normal in under an hour after exposure in optimal conditions. Kryptonite emissions can be blocked by lead and other super-dense materials.