India, Aug. 18 -- If you have ever watched a comedy movie about twins (for the 90s kids in India- 'Judwaa' would ring a loud bell) - you will have no trouble understanding this fascinating concept.

You tickle one person from the twin-pair and the other person giggles. You slap one person and the other holds a red cheek in surprise. It's simple. Anything done to one - affects the other. Why? Well, because they are 'twins'. And special ones at that.

Now take this concept to a factory or a R&D lab or a car design studio. You cannot afford to tickle, slap or tweak a full-blown machine or an aircraft engine or a concept Batmobile. It's expensive. It's risky. And it's tiring. Specially when things don't go the way you want and you end up pick...