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338 pages, Paperback
First published February 1, 2013
you simply produce more urine in your sleep as you get older
And in truth we have always altered ourselves in both psychological and physical ways. This is just the latest chapter in a continuing story. The idea of the body as a canvas is not new. It’s just that more people than ever are starting to paint.
After seeing several more bodies, it is clear that people vary on the inside at least as much as they do outwardly. We are not all the same beneath the skin.
A few units are based not on man’s dimensions but on his capabilities. An acre is the area that a man and his ox were supposed to be able to plough in a day
In Hindu tradition, nimesha is the length of a blink of an eye and paramaanus is the interval between blinking.
There are around thirty billion fat cells in the body. This figure does not change if you gain weight – at least at first. What happens is that each cell stores more energy-rich lipid, increasing up to fourfold in weight. If weight gain proceeds beyond a certain point, however, these cells begin to divide, and new fat cells are formed. After that, it’s harder to lose weight.
A slight young woman who weighs, let us say, fifty kilogrammes may possess a skeleton with a dry weight of no more than three or four kilogrammes.
Bones fuse because of gravity. In the effectively weightless environment underwater, the bones of whales and fish may never fuse, and so they carry on growing. Growth is so unimpeded in some cases that size is a good guide to an animal’s age. Humans, on the other hand, stop growing at a remarkably constant size.
bone is somewhat stronger in compression than it is in tension. A bone can typically resist a load of a tonne and a half per square centimetre before it breaks. The bones of a child’s arm are easily strong enough to support the weight of a family car, for example. Its tensile strength is nearly as great, comparable with that of metals such as copper and cast iron. Only in torsion is bone relatively weak, which explains why most fractures are the consequence of severe twisting forces.
Any functional structure must have parts that are in tension and parts that are able to withstand compression, otherwise it will either fly apart or crumble. The bones are principally used in compression. It is the muscles that provide the tension.
Bones develop in response to stress. Tiny cracks form when they are subjected to forces during normal exercise. These cracks send chemical messages instructing new bone tissue to form. However, bone will fail if pushed only a little way beyond its normal performance limit – to about 120 per cent, compared to 200 per cent for materials like steel.
We conceitedly believe we are taller than our ancestors because we eat so well. In fact, evidence from skeletons of Homo erectus and early Homo sapiens shows that they were taller than we are, owing to the strenuous work necessary to survive.
Blood entering the left chamber of the heart is warmer because, as we now know, it has been replenished with oxygen whose reaction with haemoglobin releases heat.
the body’s full quota of a gallon of blood passes through the heart in no more than a minute!
It is in compensation for the forced expulsion of part of the soul from the head that today we still say ‘bless you’ when somebody sneezes.
Current medical understanding is that a severed head can remain aware and conscious until falling blood pressure and lack of oxygen causes the brain to shut down, which may indeed take quite a few seconds.
We are all, as it happens, ‘hairy as an ape’. Humans have just as much hair as chimpanzees. It is only the fact that ours is finer, shorter and generally paler than the chimpanzee’s that leaves us free to call ourselves the naked ape.
attractive persons are more likely to be acquitted at trial
The kidney that remains in the body of a living donor soon grows by some 80 per cent, practically restoring full renal function.
Although Christianity arose out of Judaism, its attitude towards blood is sharply different. Because the Christian God is revealed in the bloody sacrifice of Jesus, blood is a central part of the ritual. Until the Fourth Lateran Council of 1215, the Christian ceremony involving bread and wine was merely symbolic of the Last Supper. The Council decreed that the bread and wine was to be regarded as the actual body and blood of Christ, and in doing so invented a ritual, the Eucharist, that could be replicated in every church in Christendom, in which the faithful could engage in a physical communion with Christ.
By the miracle of transubstantiation, believers can share in the body of Christ without disgust, neatly sidestepping any suggestion of cannibalism.
The outer ear is composed entirely of soft tissue and cartilage. There is no supporting bone. This means that it can be deformed and reformed, cut away and replaced. It is an exemplar of arbitrary human tissue.
although the iris is named after the Greek word for rainbow, it may come as a surprise to learn that there is no distinctive colour present in the eye in any case. The colours that we perceive do not arise from different pigments, but are what is known as ‘structural colour’ – an illusion of colour produced by an effect of interference between light rays that is also found in butterfly wings and iridescent bird feathers.
We are inherently multisensory beings. We see and hear together. We use our senses of smell and taste together. Combined sense signals often amount to more than the sum of their parts, and are more memorable.
synaesthesia, an effect that has always intrigued me in which a signal in one sense also stimulates a brain response in another.
The pre-Socratic philosopher Anaxagoras believed that man was more intelligent than the beasts because of his hands. Aristotle, about a century later, believed roughly the opposite, that our hands only became necessary with intelligence. Either way, they were in agreement that manual dexterity and intelligence are closely connected. This remains the consensus today, although which came first is still hotly disputed.
However, we remain, so far as we know, the only creature that points. Pointing is a highly ‘unnatural’ action. To point at something presupposes that we have a mental label or name for what is being pointed at, or else the action would mean nothing. This in turn requires the existence not just of language but of a shared language and, moreover, our understanding that the person for whom we are pointing has a mind similar to our own, so that they can infer exactly what it is, of the many things that may lie in front of our finger, we are pointing at. According to the physician and philosopher Raymond Tallis, this makes pointing ‘a fundamental action of world-sharing, of making a world-in-common’.
Indeed, it has been estimated that there are more possible hand gestures than there are words in the English language.
So-called ‘denary’ counting is based on the ten fingers and thumbs, and most other popular number bases, such as binary and bases four, twelve and twenty, are based on various combinations of limbs and digits. Even an octal system used by some Native American cultures begins with the hands: it counts not the peaks that our fingers make but the valleys in between them.
In a way, it is the presence of symmetry in the body at all that is more remarkable than when it breaks down. The process of embryonic development is one of progressive loss of symmetry.
At conception, it may surprise some to learn, we are all essentially female. Although the woman’s egg contributes an X chromosome and the man’s sperm either an X or a Y chromosome, these do not immediately determine the sex of the embryo. At eight weeks’ gestation, the fertilized egg is implanted in the uterus. If it has a Y chromosome, it then responds to a chemical signal that causes testes to begin to form, and the potential female reproductive system to wither. If not, it continues in its ‘default setting’ until, at thirteen weeks, the foetus gonads begin to transform into ovaries.
Gender is a superfluous development in grammar that should gradually wither from the world’s languages, say the experts, although perhaps it will not do so quickly: in long ungendered English, ships are still designated feminine
The form of movement that more greatly interests me, however, is dance. Here, extreme physical exertion must be combined with extreme restraint to produce artistic expression. It is at once a highly sophisticated and yet also strangely primal activity. If sport is our cultural legacy of the actions necessary for individual survival, then dance, it seems to me, is our inheritance from our first attempts to make connections. It contains the erotic, the religious and, in the synchrony of a war dance or of a corps de ballet, the urge to be one of the group. Dance is the bodily expression of civilization.
the physical activity of dance is distinguished from sport by the requirement to disguise the effort involved
A human being radiates power at a rate of 100 watts when resting, rising to 300 watts when doing exercise, which is a power conversion per unit area roughly equal to a rooftop photovoltaic solar panel, and enough that architects must take it into account when designing spaces that will be crowded with people.
Marcel Grossmann, a Swiss mathematician who was a student contemporary of Einstein, once confided to the physicist that he could not happily sit on a warm lavatory seat, to which Einstein blandly pointed out that the heat is ‘entirely impersonal so that to receive it in this way was not to be subject to an unwanted intimacy’.
The age at which we can expect to die has tripled during the course of human history.