The teeth of a tiny mollusk (Patella vulgata), which is a species of sea snails, have been found to be some of the strongest biomaterials in the world. Also known as limpets, these mollusks are a very small crustacean, often around 0.05-2 cm in size with a large cone shell and possess an incredibly complex system of teeth that dazzles the mind.

Research has revealed that the tensile strength of the sea snail’s teeth is higher than that of spider silk and is comparable to only the strongest commercial carbon fibers. It was found that the teeth of sea snails scraping algae off of rocks showed a tensile strength between 3 and 6.5 GPa (gigapascals). Spider silk roughly reaches a tensile strength of about only 1.3 Gpa. Scientists say that the snail’s teeth can even withstand the pressure that turns carbon into diamonds. Studies have determined that, to our current knowledge, there is no other material of this size (roughly 100 μm micrometers) with as much strength and durability.

This exceptional durability has led scientists to do research on the structure and functioning of these teeth, and the studies showed fascinating results.

The role of teeth in nutrition

Sea snails have a special tongue, called a radula, which they use to scrape off food from rocks. The most important feature of the radula is that it contains more than 100 rows of iron-mineral teeth. However, those used for food intake consist of only 10 rows on the outermost part of the teeth. During eating, a tremendous mechanism operates: the teeth are constantly repositioned according to their conditions of maturation and wear. Worn teeth are replaced by newly matured teeth over the course of 12 to 48 hours to ensure that fresh, sharp teeth are used instead of dulled ones.

This wonderful displacement system operates in a similar way to the movement mechanism on a conveyor belt where the teeth begin to grow primarily in the posterior part of the radula. Meanwhile, they are strengthened and matured by iron mineralization. When this mineralization is complete, they are moved towards the front of the radula. In this way, completely matured teeth are permanently retained at the far-front scraping area. During the scraping process, the matured teeth wear out at a rate equal to the growth rate. In the meantime, a new set of teeth begins to grow. By means of this magnificent cycle, new teeth are constantly created and matured so that there are no disruptions in nutrition.

Biomineralization

The structure of the sea snail’s teeth is also a masterpiece of material science. The dazzling durability of its structure provides optimum strength when scraping food off of rock surfaces.

Although the exact process of biomineralization of the teeth is not known, it is believed that it involves reactions of dissolution and re-precipitation. When the non-mineralized matrix is examined, well-arranged and densely packed chitin fibers are observed that are only a few nanometers apart. The matrix is a structure which keeps the reinforcing material together in layers that are composed of different materials. This organic matrix serves as a framework for crystallization in the structure of the teeth. In the mineralization system, the basic macromolecule α-chitin component is created first. The first mineral that then precipitates is the “goethite,” i.e. the aqueous iron-oxide mineral, which crystallizes parallel to the chitin fibers. These crystals are nucleated on the chitin fibers and formed between them by pushing and pulling the fibers. This way, crystals placed in order cause biomineralization of the structure.

It was found that 80% of the overall volume of the structure is composed of these crystals. The gap between the crystals and the chitin matrix is filled with amorphous silica (SiO₂). The iron contained in the aqueous iron-oxide mineral is the metal that constitutes the largest proportion of the composition. Other metals such as sodium, potassium, calcium, and copper are present in different proportions depending on the sea snail’s exact geographic location.

Critical factors in durability

The most important reason that the sea snail’s teeth have such high durability is because the fibers of the aqueous iron-oxide minerals in the teeth are nano-scale. This is due to the fact that materials of this size are not affected by the conditions that reduce strength.

Another critical durability factor is the small length of critical fibers. Critical fiber length is a parameter that defines the length of a material required to transfer strain from the matrix to the fibers at the time of external pressure. To achieve maximum strain, the length must be greater than the critical length. Materials with a large critical fiber length can hardly reinforce the matrix because most of the strain is not transferred to the fibers and remains on the matrix. On the contrary, materials with smaller critical lengths can transfer the strain on the matrix to the fibers. Therefore, they serve as an effective reinforcement for the matrix.

Fibers of aqueous iron-oxide minerals are of a critical length of 420 to 800 nanometers. This is much smaller than the length of the fibers in the teeth of about 3.1 µm (micrometers). This shows that nanofibers are an effective reinforcer for the matrix and contribute greatly to the ability of the teeth to bear loads.

Besides the structure and composition of the snail’s teeth, its morphological shape is also important in providing strength. It ensures that the strain is evenly distributed all over the tooth.

Modeling of biomaterials

All these studies indicate the presence of high-strength composites, which is when a material obtained by combining two or more materials with different physical characteristics, in nature.

Sea snail teeth, which have been created as a highly resistant and strong biomaterial, act as an inspiration for engineering and material science. Their characteristics, such as content and design, are expected to be modeled in areas that require durability and rigidity.

These marvelous systems found in the natural world, sometimes in creatures as tiny as a snail or mollusk, serve as a reminder that nature is filled with wonders for us to explore.

References

· Barber, Asa H., Dun Lu ve Nicola M. Pugno, Extreme Strength Observed in Limpet Teeth,  Journal of The Royal Society Interface, April 2015, DOI: 10.1098/rsif.2014.1326, PubMed.

· World’s Strongest Natural Material Discovered, How It Works, Imagine Publishing, No. 71, p. 11.

· en.wikipedia.org/wiki/Limpet
www.iflscience.com/plants-and-animals/worlds-strongest-natural-material-limpet-teeth/

· www.newworldencyclopedia.org/entry/Limpet

· Barber Asa H., Lu Dun and Pugno Nicola M. “Extreme strength observed in limpet teeth.” 12. J.R. Soc. Interface. http://doi.org/10.1098/rsif.2014.1326

I have so far read hundreds of books on Islamic literature both in Urdu and English. I have even gone through a number of different translations and interpretations of the holy Qur’an and Hadith. But I do think that this book is unique in its own way. It has not only broadened my horizon of thinking but filled my empty heart with the precious pearls of wisdom and knowledge. It has left within me the craving to receive wisdom and knowledge all the time. This book has helped me to become a firm believer and an admirer of our Prophet and his equally great Companions. The vast shades of their lives and struggles which went to achieve their overwhelmingly great targets set by Almighty God left me mesmerized and completely engrossed.

Any person who enjoys reading would not be able to keep himself or herself unmoved if he or she gets the chance to go through such an emphasis made in this book encouraging readers to try their best to emulate the Prophet in every possible way and guide them to become a human as God has envisaged for them so that they can understand the intricacies of this world and the next.

While most of the literature available about the Prophet can be categorized as biography, The Messenger of God is different in its own sense. Gülen’s methodology in this volume lures the intellectual minds. He has picked up some best incidents and traditions first and then argues after that in the light of his life and works and how the Qur’an was a help and guide at each and every moment of his struggle in preaching the religion of Islam. After reading the whole book, one feels that not a single aspect of the Prophet and his Companions’ lives is left untouched. We get the opportunity to know each and every detail that needs to be known about such a great personality.

Whether you want to know about his intellectual and spiritual strength, or of his long journey with his beloved Companions, every aspect which comes into mind is addressed. Its first chapter, for example, starts with a description of the Prophet’s life as mercy upon all human beings and jinns because he was sent to both of them. Then it takes readers towards the other serious discourse like why Prophets are sent, why they are important and why we needed them so urgently. This discussion is followed by a new chapter that opens with a new set of stimulating ideas as to which type of characteristics the Prophets were given by God, particularly to the last Prophet including the essentials of Prophethood.

The book could easily be divided into two parts as it was done before, because after the long and elaborate discussion on the intellectual aspects of the Prophet, it delves into the other side of his life, like how he lived his life as a family head, social, political and military leader and so on.

The other strength of the book is that it is thoroughly well-researched and never asks the readers to jump on an opinion or accept an idea only on the strength of their belief but it allows them to accept after weighing the facts on the scale of their own wisdom and intellect.

The writer has truly taken a deep pain to complete all these vast topics which require a special book separately to discuss all things in detail. You simply fall in love with the book as it takes one so easily on its vast journey of thoughts with its own strength and merit.

A: The sparrow hawk’s swooping contributes to the sparrow’s alertness and evolving skills of escape. Although rain, electricity, or fire sometimes harms people, no one curses them. Fasting may be difficult, but it provides the body with energy, activity, and resistance. A child’s immune system usually gains strength through illness. Gymnastics are not easy, but they are almost essential to bodily health and strength. People’s spirits are refined through worship and meditation as well as through illness, suffering, and hardship. These allow them to acquire Paradise, for God gives a large reward for a little sacrifice. Hardships and sufferings promote people to higher spiritual degrees, and will be returned manifold in the other world. This is why all Messengers experienced the most grievous hardships and sufferings.

Hardship, suffering, and calamity cause believers’ sins to be forgiven, warn them away from sins and the seductions of Satan and the carnal self, help them appreciate God’s blessings, and open the way to gratitude. Also, they urge the rich and healthy to be concerned about the ill and the poor and to help them. Those who have never suffered cannot understand the condition of those who are hungry, sick, or stricken with a calamity. In addition, these afflictions may help establish closer relations between different social sectors.

Q: What is the role of intention in fasting?

A: Intention has a prominent place in our actions, for the Messenger told us that our actions are judged according to our intentions. Intention is the spirit of our actions, for without it there is no reward. If you remain hungry and thirsty from daybreak to sunset without intending to fast, Allah does not consider it a fast. If you fast without intending to obtain God’s good pleasure, you receive no reward. So whatever one intends, one gets the reward thereof.

Those who have a firm belief in God, the other pillars of faith, and the intention to believe in them will be rewarded with eternal felicity in Paradise. But those who are determined not to believe, who have removed the inborn tendency to believe from their hearts, will be victims of their eternal determination and deserve eternal punishment. As for those with deeply ingrained unbelief and who have lost the capacity to believe, we read in the Qur’an: As for the unbelievers, it is the same whether you warn them or warn them not. They will not believe. God has set a seal on their hearts and on their hearing, and on their eyes there is a covering (2:6-7).

Q: What about those who say that fasting for so long is unhealthy or affects one’s job performance or even the nation’s development?

A: Human life is a composite of two distinct powers: the spirit and the flesh. Although they sometimes act in harmony, conflict is more usual “ conflict in which one defeats the other. If bodily lusts are indulged, the spirit grows more powerless as it becomes more obedient to those lusts. If one can control the desires of the flesh, place the heart (the seat of spiritual intellect) over reason, and oppose bodily lusts, he or she acquires eternity.

Compared with previous centuries, people may well be wealthier and enjoy more convenience and comfort. However, they are trapped in greed, infatuation, addiction, need, and fantasy much more than ever before. The more they gratify their animal appetites, the more crazed they become to gratify those appetites; the more they drink, the thirstier they get; the more they eat, the hungrier they get. They enter into evil speculations to feed their greed to earn still more, and sell their spirits to Satan for the most banal advantages. And so they break with true human values a little more each day.

To sacrifice one’s enjoyment of worldly pleasures has the same significance for human progress as roots have for a tree’s growth. Just as a tree grows sound and strong in direct relation to its roots’ soundness and strength, people grow to perfection whose striving to free themselves from selfishness so that they can live for others. 

Q: What spiritual practices and outlooks should one make a special effort to acquire during Ramadan?

A: Muhasaba (Self-Criticism or Self-Interrogation): Self-criticism may be described as seeking and discovering one’s inner and spiritual depth, and exerting the necessary spiritual and intellectual effort to acquire true human values and to develop the sentiments that encourage and nourish them. This is how one distinguishes between good and bad, beneficial and harmful, and how one maintains an upright heart. Furthermore, it enables a believer to evaluate the present and prepare for the future. Again, self-criticism enables a believer to make amends for past mistakes and be absolved in the sight of God, for it provides a constant realization of self-renewal in one’s inner world. Such a condition enables one to achieve a steady relationship with God, for this relationship depends on a believer’s ability to live a spiritual life and remain aware of what takes place in his or her inner world. Success results in the preservation of one’s celestial nature as a true human being, as well as the continual regeneration of one’s inner senses and feelings.

Tafakkur (Reflection):Reflection is a vital step in becoming aware of what is going on around us and of drawing conclusions from it. It is a golden key to open the door of experience, a seedbed where the trees of truth are planted, and the opening of the pupil of the heart’s eye. Due to this, the greatest representative of humanity, the foremost in reflection and all other virtues, upon him be peace and blessings, states: No act of worship is as meritorious as reflection. So reflect on God’s bounties and the works of His Power, but do not try to reflect on His Essence, for you will never be able to do that. By these words, in addition to pointing out the merit of reflection, the glory of mankind, upon him be peace and blessings, determines the limits of reflection and reminds us of our limits.

Shukr (Thankfulness): True thankfulness in one’s heart is manifested through the conviction and acknowledgment that all bounties are from God, and then ordering one’s life accordingly. One can thank God verbally and through one’s daily life only if personally convinced, and if one willingly acknowledges that his or her existence, life, body, physical appearance, and all abilities and accomplishments are from God, as are all of the bounties obtained and consumed. This is stated in: Do you not see that God has made serviceable unto you whatsoever is in the skies and whatsoever is in the earth, and has loaded you with His bounties seen or unseen? (31:20), and: He gives you of all that you ask Him; and if you reckon the bounties of God, you can never count them (14:34).

Of course, one should try to increase in all virtues during Ramadan, as this is the best time of year to do so.