Don't listen to the other write-ups: bionics aren't a design concept or a way to solve engineering problems. Bionics are what
Oscar Goldman used to turn injured
test pilot Steve Austin into the
Bionic Man.
Later, there was a
bionic woman (bionic ear arm and legs, could rip a phone book in half, was a teacher), a bionic boy (sadly his bionics didn't take), and a bionic dog.
Bionics are best used for running in slow motion, jumping really high, looking at things that are far away (although those crosshairs get in the way), lifting fake-looking boulders, and fighting
Maskatron,
Bigfoot, or
Russian space probes.
In 1970s dollars two bionic legs, one arm, and an eye cost six million dollars, although I'm sure some form of
Moore's law holds and contemporary bionic
secret agents sport much cheaper limbs which possibly don't even make
that annoying "ch-ch-ch" sound.