Super-Hearing
One of the hardest powers to control was his super-hearing. At school, Clark couldn't concentrate on what his teacher was saying when he could hear her heart beating, a phone ringing down the hall, and every word everyone in the building was saying! Clark learned to control this by focusing on one thing at a time. Now he can use his hearing with amazing sensitivity. He is able to pick out a single voice from miles away, or attend to the softest sound in the middle of a screaming crowd.
X-Ray vision
Another power that Clark had a hard time controlling was his X-ray vision. It was great to be able to see through walls, but awful to be talking to people and then suddenly seeing their skeletons through their skin! Martha helped Clark accept this strange power and kept him from being overwhelmed by the new images. After years of practice, Clark has honed his vision to pinpoint accuracy. He can see clearly through a building, or he can tell people standing next to him exactly what's in their pockets.
Heat vision
Later Clark learned the ability to channel the energy in his cells into a beam of red light and shoot them out of his pupils. He could control the intensity of the energy beam in different situations: a gentle beam can heat up a doorknob, and a stronger beam can cut through a sheet of metal like a laser. Or Superman can unleash a barrage of super-strong energy beams that can cause great destruction.
Super-strength
Having absorbed the sun's radiation with his cells, Superman becomes incredibly strong. He first used his strength to push a school bus out of the river; though risky to reveal his strength to so many people, Clark knew it was the right thing to do. He can lift trucks and hurl them away as if they were baseballs. He can bend steel bars or cruch diamonds with his bare hands. He can hold havy objects over his head without even getting tired.
Invulnerability
Due to his strong cells, it is nearly impossible to injure Superman. He can stand in a fiery inferno or walk across the freezing ridges of Antartica and be perfectly comfortable. Bullets and blades bounce right off of his super-strong skin. He can even withstand the force of an explosion.
Flight and super-speed
When he grew up and found a safe place to test himself, Clark wanted to see what would happen if he gathered his strength and leapt into the air. To his surprise and delight, Clark discovered that he could fly! at first, he just hurled himself into the air and came crashing right back down to the ground. But he quickly learnt to control his new ability, and can fly as long as he wants, or even hover in midair or fly all the way to outer space. His reflexes are equally quick, enabling him to think and react in time to control his actions when moving at super-speed. He can accelerate to the point that he's moving swifter than the speed of sound, leaving a thunderous sonic boom in his wake.
