5. SUPER-STRONG METAL? Bingo. The U.S military is already experimenting with body armor -- called "exoskeletons -- that provide force amplification, Kakalios says. "They enable someone to lift 200 pounds as if they were lifting 20 pounds." The drawback: "The exoskeletons I've seen," Kakalios cautioned, "have long power cords trailing behind them." As far as finding a material that would stand up to enemy attack, titanium -- named for the Titans of Greek myth -- might do the trick. Titanium alloys, which resist corrosion, are used today for weapons and aircraft. Titanium is as strong as steel, with only about half the weight. That means a suit for a real-life Iron Man, Kakalios estimates, might only weigh about 150 pounds -- not a problem for a buff guy such as Stark.
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