The Hand: A Marvel of Engineering

The hand, a marvel of engineering, is an organ specially created for human beings by God, and reveals with its perfect features the flawless nature of our Lordís creation.

Our hands, which enable us to perform some very ordinary acts such as stirring a cup of tea, turning the pages of a newspaper, or writing, are incredible engineering wonders.

The most important feature of the hand is its ability to operate with high efficiency in very distinct activities, despite having a standard structure. Being furnished with a great number of muscles and nerves, our arms help our hands grip objects strongly or softly according to different circumstances. For instance, the human hand, although when not formed into a fist, can strike a blow strike against an object with a weight of 45 kilograms. However, our hand can also feel, between its thumb and forefinger, a sheet of paper one tenth of a millimeter in thickness.

Obviously, these two acts are of a totally different character. As one requires sensitivity, the other requires great force. We, however, never even think for a second what we have to do when we take a sheet of paper between our fingers or hit with a fist. Nor do we think how to adjust the strength for these two acts. We never say, "Now I will pick up some paper. Let me apply a force of 500 g. Now I will lift this bucketful of water. Let me apply a force of 40 kg." We even do not bother to think about these.

The reason is that the human hand is designed to perform all these acts simultaneously. The hand is created together with all its functions and all its related structures concurrently.

All the fingers in the hand are the appropriate length and position, and proportionate to each other. For instance, the strength of a fist formed with a hand having a normal thumb is greater than that formed with a hand having a shorter thumb, because with its pre-determined appropriate length, the thumb covers other fingers and helps augment their power by supporting them.

There are many small details in the structure of the hand: for instance, it has smaller structures besides the muscles and nerves. The nails at the tip of the fingers are by no means trivial accessories. When we try to pick a needle from the floor, we use our nails as well as our fingers. The rough surface comprising our fingertips and nails helps us in picking up small objects. Last but not least, nails play a big role in the regulation of the minute pressure fingers have to exert on the object they hold.

Another distinctive feature of the hand is that it does not get tired.

Robot Hands Are a Failure

The worlds of medicine and science spend a considerable effort on making an artificial copy of the hand. The robotic hands so far manufactured have the same performance as human hands in terms of power, yet it is hard to say the same thing for sensitivity of touch, perfect maneuverability, and the ability to do diverse jobs.

Many scientists agree that no robot hand can be made having the complete functions of the hand. Engineer Hans J. Schneebeli, who has designed the robotic hand known as "The Karlsruhe Hand", stated that the more he worked on robotic hands, the more he admired the human hand. He added that they still need a lot of time to make possible even a certain number of the jobs accomplished by a human hand.

The hand usually functions in co-ordination with the eye. The signals reaching the eye are transmitted to the brain, and the hand moves according to the command given by the brain. These, of course, are completed in a very short time and without making us spend a special effort to do them. Robotic hands, on the other hand, can only rely either on sight or touch. Different commands are needed for every move they make. In addition, robotic hands cannot accomplish diverse functions. For instance, a robotic hand playing the piano cannot hold a hammer, and a robotic hand holding a hammer cannot hold an egg without breaking it. Some robotic hands that have only lately been produced are able to perform 2-3 actions together, but this is still very primitive when compared to the abilities of the hand.

In addition, when you consider that the two hands co-operate with each other in perfect harmony, the flawlessness of the design of the hand becomes more explicit.

God designed the hand as an organ especially for human beings. With all these aspects, it shows us the perfection and uniqueness in Godís art of creation.