DC's Flash is a perfect example of the single-power hero. As the Fastest Man Alive, Barry Allen (and later Wally West and the other speedsters who have stepped into the Flash's shoes) lacks the dozens of powers of Superman, Wonder Woman and the other regular members of the Justice League, but manages to find a new use for that power in seemingly every other issue. Among his powers derived from his speed is his ability to heal much faster than an average human — but as seen inTeen Titans #3, this comes at a price.
During the beginning of the Flash's career, he would continually test his powers against the laws of physics. Quasi-scientific explanations for those powers were frequent if not always scientifically accurate; his suit was made out of a friction-resistant material, for example. But no explanation could withstand a man routinely running faster than the speed of sound (and eventually light), and the Speed Force was revealed in the 90s: a source of energy from which all speedsters draw their power. It's the Speed Force that allows Flash to run around the world in seconds and turn on a dime without igniting a massive fireball in front of him, or creating massive holes in the concrete below his feet with every step.
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Cyborg races into a hospital, carrying Impulse (Barry's son Bart Allen, the latest individual to become a speedster in the DC Universe) and revealing to an astonished ER that the patient has been shot in the knee. A nearby doctor observes that the leg looks partially healed and Cyborg explains that the Flash's metabolism works much faster than humans. «Heals quickly. Not correctly.» To add insult to a very literal injury, a
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