limbs

Human running speeds top out near 28 mph, if the record-breaking feats of Jamaican speed demon Usain Bolt prove anything. But scientists say that the biological limits of human running could theoretically reach 35 or even 40 mph -- assuming that human muscle fibers could contract faster and allow people to pick up their pace.

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Just because most mutants don't gain special powers doesn't make them any less interesting. Case and point, this snake discovered the other day in Southwest China. Looking at the picture, you should be able to figure out what makes this snake different from most. Namely, the weird clawed limb sticking out of its side.

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Imagine going for a decade without any hands and then suddenly having a new set to work with. That's what happened to Jeff Kepner, the first person to receive a double hand transplant in the U.S.

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Nip off the leg of this little axolotl salamander, and he grows it right back. The beasts' regenerative powers extend to their limbs, skin, jaws, those feathery antler-gills on its head, and even parts of its nervous system and brain. Now the U.S. Department of Defense has allocated $6.25 million to research how it does its thing, and whether we can do the same.

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Werner O. Merlo’s patio umbrella refused to stay locked in a tilted position. Frustrated, he replaced the sagging sunshade’s flimsy ball-and-joint with a self-designed mechanism that swiveled smoothly yet held fast at an angle. His umbrella never flopped over again. "I'm not really the umbrella-manufacturing type, so the first thing that came to mind was, What else can I use this for?" says Merlo, a former chemist at the University of Alberta.

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