Can the photocopy machine explain death?
Wednesday, October 26th, 2005Here’s a situation which may sound familiar, at least to most guys out there. A friend of yours, let’s call him Ram, meets up with you and the gang at school during recess time, and excitingly declares that he has a new tape. A ‘tamil’ movie he says with a wink. He says he got it from his neighbour, who, in his infinite wisdom, quietly stole it from his elder brother and taped it himself. Your friend, realising the value of the movie, records a copy for himself as well. Ram asks if anyone wants to borrow it next, but of course, he didn’t really have to ask. He knows every single guy in the gang would want his turn. All 15 of them. So, the gang draws lots, and you of course draw the shortest straw (in more ways than one!). So, you wait and wait and wait with anticipation.
Ram gives the tape to Lee, who records a copy for himself, then passes his copy to Tan. Tan also doesn’t want to miss out, so records a copy for himself, then passes his copy onto Suren, who copies it then passes it to Faroukh, and so on and so forth until you finally receive the tape some two months later (by which time everyone has spoiled the movie by revealing the ending!).
So, after school, with the tape in bag, heart pulsating, you cycle home like you’ve never cycled home before. You reach home, have lunch, and suggest to your mom that she needs to go to the supermarket to top up on milo and ice cream. As soon as she’s gone, you turn on the TV, put in the tape, and press PLAY. Ooooh yeah… you start rubbing your hands (to warm them up for their upcoming duties…) and watch… a blank screen. You press stop, and press play again, to no avail. You eject the tape, knock it on the video, put it back in and try again, but that accomplishes nothing. Damn.
A very similar thing happens with photocopy machines. If you take a plain white piece of paper, photocopy that, take the output, photocopy that, and repeat a thousand times, you’ll end up with a black piece of paper. That’s because everytime you copy something, you add a bit of unwanted noise to the output. Repeat this a thousand times and the output is totally dominated by noise. Hence the black photocopy paper output, and hence the blank tamil movie.
But how is this related to death? One would say that not being able to watch the tamil movie is almost like death, but that’s not really my point. My point, or my question is : why do humans die from old age?
The fact is, there is no part of our body that is older than about 3 years of age. That’s because cells continously renew themselves by getting replaced by younger, hungrier ones. This happens throughout a human’s lifespan, regardless of age. The cells have a maximum lifespan of 3 years, and most of the time they get replaced by then. So, the next time someone asks "how old are you?" your answer is "it depends which part of my body".
So, if an 80 year old man has cells that are on average, the same age as that of an 18 year old, why does the 80 year old man die sooner? Well, one theory is that the aging process is a side effect of the copying process - each time old cells are replaced, they are not replaced by an exact copy, but by a slightly degraded copy of itself. So, if the cells keep getting replaced with inferior copies, well, at the end you end up with crap. Much like the photocopy output. Much like the tamil movie.
