There are many physiological events that puzzle scientists. Menopause is one of these as it is very uncommon in other mammals. Why do human females stop having periods after aging? From an evolutionary point of view, an organism that has lost reproductive function cannot aid evolution and thus it is a mystery how a trait like menopause survived natural selection. The leading theory in how such a phenomenon happened is the grandmother hypothesis.
According to this hypothesis, as humans are social animals menopause can still be an evolutionary advantage despite not being able to produce offspring. This is because older women can invest the massive amount of energy and time required to upkeep childbearing in other places. For example, they can help their family and society grow by working or taking care of children instead. Furthermore, as the probability of miscarriages and congenital defects rise with aging (generally after a woman hits the age of 30, the chances of a healthy pregnancy decreases), menopause has the function of protecting the gene pool of the species. These facts combined lead to the conclusion that after an individual has reached a certain age, taking care of their children or grandchildren instead of birthing more offspring is more effective in propagating their own genes. Also, there is no one that can propagate massive amounts of wisdom and information to the next generation like the elderly.
In modern society, menopause has more significance than at any point in the history of human beings. As our average life span has surpassed 80 and heading towards 90, almost half of a woman’s life is post-menopause. In some ways, the grandmother hypothesis contains within it a certain philosophy regarding life. As we age, we give birth to children and raise them until they become independent, at which point we escape our basic biological duty of reproducing to lead our “own” lives. Senescence is like a second spring after one’s “biological” life. It is the start to a new life – a more “human” life of your own where you can focus on seeking pure happiness.
Once upon a time, there lived a beautiful girl named Psyche. Psyche was so beautiful that she even caught Aphrodite’s eyes. Despite being the goddess of love, Aphrodite was known to be very jealous and felt threatened by Psyche’s beauty. She commanded her son Eros, the god of love, to put a spell on Psyche. Eros uses the Bow of Love and anyone shot by his golden arrows falls immediately and helplessly in love with the first thing they see.
Aphrodite came up with a devious plan to have Eros shoot Psyche and have frogs around her, making her fall in love with frogs and fall into a despairing relationship. But her jealous plan was overthrown by an unexpected event. When Eros first saw Psyche’s face, he became entranced and accidentally pricked himself with his own arrow. Thus, Eros became madly in love with Psyche. Aphrodite, enraged by this, cursed Psyche to never find a mate for the rest of her life. Eros became depressed from not being able to see Psyche and gave up shooting golden arrows. After he gave up his job, no animals or human fell in love and no new life was born. Aphrodite could not bear to see such a scene and begged Eros to start shooting arrows again, offering him one thing that he wanted. Eros said that he desired Psyche without hesitation and Aphrodite reluctantly allowed them to meet.
While this happened, Aphrodite’s curse made no man come to propose to Psyche. Her parents became worried and asked the advice of the oracle at Apollo’s temple. The oracle stated that as she is destined to marry a monster, she must be placed atop a mountain in bridal attire. Accepting her fate, Psyche stood on the mountain but eventually jumped off a cliff in despair. But Zephyrus the West Wind caught her and brought her safely to Eros’ place, just as Eros planned. Psyche enjoyed a comfortable life in the beautiful castle with many maids at her service. However, her husband only came in the deep dark of the night. Whether it was because he feared Aphrodite’s wrath or the difference between a god and a mortal, he asked her to never try find out who he was and that if she truly loved him, she should trust him. But Psyche eventually fell victim to her jealous sisters’ scheme and her curiosity, leading to her accidentally dropping candle wax on Eros’ face as she took a peek at his face. Eros was awakened and became enraged. He chased her away and forbade her from coming back. Psyche fell in despair and threw herself into the river, but the river carried her to the riverside where the shepherd god Pan rescued and consoled her.
At first, Psyche tried to find Eros while avoiding Aphrodite, but eventually she decides to plea directly to her. Despite her bravery, Aphrodite threw challenging tasks one after another at her like a mean mother-in-law, ultimately commanding her to retrieve some beauty from Persephone, the queen of the underworld (since travelling to the underworld signifies death, Aphrodite must have truly hated Psyche).
However, Psyche was determined to see Eros even at the cost of her life. Admiring her commitment, a tall tower before the underworld gave her a hint. It told her to place two coins on her tongue and bread in each hand when going to the underworld. The coins would be to pay Charon the ferryman while the bread would distract Cerberus the three-headed dog guardian. She succeeded in seeing Persephone, who gave her a box of beauty and told her to never open it. But wanting to look beautiful in front of her lover (Eros), Psyche opened the box. The box did not contain beauty, but instead contained a death-like sleep from the underworld, putting Psyche in a deep sleep. Although he chased her away, Eros came back to see Psyche and found her in this sleeping state. He took the corpse-like Psyche and kissed her softly on her lips, awakening her from the deep sleep.
Eros eventually sought help from the king of gods, Zeus, to persuade Aphrodite. After Zeus’ persuasion and seeing the love the two have for each other, Aphrodite accepted the relationship and Zeus gave Psyche the immortal drink ambrosia to make her into a goddess. The now immortal Psyche and Eros were married and had a daughter named Hedone (like in Hedonism), the goddess of sensual pleasures.
Eros symbolises physical and sensual love while Psyche is a Greek symbol for butterflies, the soul and emotional love. Ergo, Eros and Psyche represent the union of physical and emotional love into perfect love. Love and the soul are inseparable things. The most basic instinct of any organism is to reproduce and human beings have evolved that into the sacred concept that is love. To speak bluntly and without philosophy, from a purely biological perspective there is no greater purpose to life than to find a suitable mate and leave descendants. There is nothing more fundamental than pure love.
Have you ever had a moment when something so unbelievable, so improbable that you never would have imagined it would happen, happened? When something you could only dream of actually happened in real life? When something so impossible that you must have stepped into a parallel universe for that thing to happen? The feeling that such a moment brings is indescribable.
Success is not about money and power. Success is not a product of luck. To become successful, one must change their state of mind first. The most crucial thing to understand is that the only limit is that there are no limits. Only when you dare to go past what is possible will you attain anything worthwhile. “To the impossible?” you may ask. No, true success lies beyond the impossible. A place where the possible and the impossible meet to become: the possimpible. Only when you have become the master of the possimpible will you be able to confidently say that you have succeeded in life.
Anyone who has studied mathematics to some degree will know about algebraic equations. An algebraic equation is an equation that can be solved to find the unknown value of x. A quadratic equation is an algebraic equation with x², or in other words has two valid solutions to x. Generally speaking, a quadratic equation can be expressed in the following fashion: ax² + bx + c = 0. a, b and c are constants and the equation can be solved to find x. A quadratic equation is definitely more complicated to solve compared to a linear equation and it can be solved using various means and applications such as factorisation. As these methods are learnt in school and this Encyclopaedia is technically not a mathematics textbook, such methods will not be delved into.
If you have not learnt it already, there is a shortcut method to solving quadratic equations: the quadratic formula. This formula can easily find x if you simply substitute in the values for a, b and c. Of course this formula only works if the solutions are real numbers. The quadratic formula is as follows:
As you can see, because of the ± sign, the formula can be used to find both solutions to a quadratic equation. Even without factorising, it can find the answer as long as you substitute numbers into it on a calculator, making maths class very easy. However, as mentioned above the Encyclopaedia of Absolute and Relative Knowledge is not a mathematics textbook and one should instead learn properly from their teacher, not using the formula until they have been taught it properly.
We were all born from our parents. Our parents were all born from our grandparents. Everyone has a family tree and a root. If so, is it possible to find the beginning of mankind – our true “root”?
Our cells have an organelle (a part of the cell) called mitochondria. Mitochondria act as the cell’s engine and allow the cell to generate energy through respiration. An interesting fact about them is that they are not originally “ours”. About 1.5 billion years ago, there was an event where a prokaryote (cells without a nucleus, like a bacteria) invaded (or was eaten by) a eukaryote (cells with nuclei, like our cells). The prokaryote and the cell began a symbiosis and the prokaryote became a part of the cell.
Due to the external origin of mitochondria, they have a different genome to us. This is called mitochondrial DNA, shortened to mtDNA, which allows mitochondria to divide and synthesise proteins without the help of the host cell. It used to be a completely independent organism, but it has lost some of its functions to the cell.
mtDNA is inherited in a different way to normal DNA. Normally we receive half of our mother’s and half of our father’s genes, but we only inherit our mother’s mtDNA. This is because sperm keeps mitochondria in the tail which is lost during fertilisation, meaning our father’s mitochondria cannot be inherited. The only way to gain mitochondria is from those in the cytoplasm (the material that fills cells) of our mother’s egg. This is known as maternal inheritance.
Using this information, scientists compared a large sample of people’s mtDNA to turn back the clock. Knowing that a child and its mother share the same mtDNA and the mother and grandmother share the same mtDNA, we can analyse mtDNA to find the origin of mankind, or our first common female ancestor – also called Mitochondrial Eve.
Mitochondrial Eve is estimated to have lived 200,000 years ago in Africa, thus she is also known as African Eve. Her mtDNA is an ancient heirloom passed along generation after generation to us, as evidence of evolution. Every living person on the face of the Earth is a descendant of her. So in some ways, it could be said that we truly are one big family.
In 1967, a group of scientists designed an experiment where five monkeys were put in one cage with a ladder in the middle and a banana suspended over it. When a monkey tried to climb the ladder to reach the banana, it was hosed down with ice cold water to discourage it. However, at the same time the four other monkeys were sprayed as well. This was repeated until the monkeys were conditioned not to climb the ladder as it meant being blasted by cold water. Interestingly, even when the reward was tempting enough for a monkey to brace the cold water and climb the ladder, the monkey was swiftly taken down by the other monkeys – fearing the cold water – and was punished by a beating. This further discouraged the monkeys from climbing the ladder even when the researchers stopped spraying the monkeys with water.
The researchers then substituted one of the original monkeys with a new monkey who had not been in the cage before. This new monkey immediately noticed the banana and started to climb the ladder. The other monkeys saw this and responded with rage, enforcing their unspoken “rule” of never climbing the ladder. The new monkey quickly learned that climbing the ladder was a bad thing.
The researchers substituted another original monkey for a new monkey and the same thing happened. They repeated this until all monkeys were replaced.
When they substituted the last monkey in (number 10), the cage was already filled with “new” monkeys who had never been hosed before, but nonetheless knew not to climb the ladder. When the monkey was punished for climbing the ladder, it gave an expression that seemed to question why he was being punished. The other monkeys did not know why; none of them had been punished with cold water and only knew that the other monkeys would beat him up. Even though none of them knew why the punishment was required, they dished it out regardless. The rule had been engrained into the mob, with each monkey following it without any logical reason.
Red, green, blue, white… There are many colours that we can see and there are even more different combinations of colours possible. It is common knowledge that some colours clash with each other while some synergise very well. A common example of a “good combination” is when you use complementary colours. Complementary colours are two colours that oppose each other on the colour wheel, creating an effect where they brighten each other. This makes it very eye-catching and attracts people’s attention. For example, blue and orange make a bright contrast making them a popular colour choice for movie posters. Red and green, and yellow and purple are also examples of complementary colours. Complementary colours are an important concept in art and design as it helps the product stand out.
Complementary colours have an interesting relationship with our sense of sight. If you stare at a colour for a while then quickly look at a blank, white surface, you will see an afterimage of the complementary colour. A good example is when you have your eyes closed under bright sunshine and upon opening your eyes the world seems a blue hue (the blood vessels in your eyelid make the light appear orange as it reaches your eyes). This is because the retinas try to negate the intense colour by downregulating the nervous signals corresponding to that colour, which makes the complementary colour stand out. Furthermore, the photoreceptors in the retina become fatigued after stimulation, causing a reduction in the signals sent for that colour.
Knowing about complementary colours is very useful when designing a sign or poster that easily attracts people.
Everyone experiences the phenomenon of a tune being “stuck” in one’s head. This is when an addictive song or piece of music seems to play over and over in someone’s mind even when they are desperately trying to forget it. The Germans call this phenomenon ohrwurm, which translates into “earworm”.
Having an earworm is not necessarily a pleasant thing, as the person with it may become irritated or agitated by the piece of music. It has been noted that the condition is much more common in people with obsessive-compulsive disorder (OCD), suggesting that earworms may be caused by the brain subconsciously obsessing over the piece of music.
Because it is so common and addictive, earworms are extensively used in marketing in the form of hooks – music designed to stick in people’s heads. By associating the hook with the marketed brand or product, people cannot stop thinking about it and this subconsciously affects their buying habits.
The concept of earworms is also popular in literature, where authors become creative and explore the “potential” of an earworm. For example, Arthur C. Clarke wrote a short story titled The Ultimate Melody where a scientist invents a melody that compels the brain to become enraptured by it through synchronising with brainwave patterns. Interestingly, the scientist creates the melody simply to escape the barrage of pop music filled with hooks and catchy tunes. Ultimately, he is found catatonic as the melody completely takes over his mind.
