The three were genetically designed to be perfect human children but got an accidental dose of Chemical X, which gave them superpowers.

More Darrin Stephens than Albert Einstein, the Professor mixed sugar, spice and everything nice with an accidental dose of Chemical X. Whammo!

Girls have their own action heroes, like the Cartoon Network's popular Powerpuff Girls, a trio of 5-year-old sisters created out of sugar, spice, everything nice with an accidental dose of Chemical X, which gave them superpowers that are always used for good.

Even within species, there may be difference among individual birds in their resistance to toxic materials-a bird that is on a usually healthy diet will be more immune to an accidental dose of toxic food than a bird that is usually on an insufficient diet; genetic dispositions also play a role.