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18 Aug 2019

Modern human beings, especially women, cut their armpit hair. Itseems to me the armpit hair is trivial/useless. Shortly speaking,what is the armpit hair for?

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Tod Thiel
Tod ThielLv2
19 Aug 2019

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Related questions

Albinism is an autosomalrecessive condition characterized by absence of melanin pigmentfrom the skin, eye and hair. Two carriers of albinism marry andplan to have four children. Assume a 1:1 sex ratio. What is theprobability that all their children will be normalgirls?


I already know the answerplease help me understand how to do it. Please be detailed for fullpoints.

Almost all organs in the human body have a rather largethreshold within which the organ or tissue is capable of repairingitself using materials supplied by the body, whether it's made fromorganic tissue or structural proteins. Wounds and minor damage tothe skin or flesh for example heal by themselves, skin, nails andbody hair can grow back if damaged or removed, even most bones canbe repaired autonomously by a biological body. Cutting off asignificant chunk from the human flesh or removing over 90% of ahair or a nail would cause no permanent injury, and the body iscapable of repairing the damage over time with ease. The vastmajority of the human body (not counting critical organs such asthe heart or the brain) can be "grown back" to an extent by itself,because such parts have a rather large damage threshold.

On the contrary, teeth do not. There is a certain threshold inwhich tooth enamel can be supplied and "repaired" by the body to anminimal degree, but past that point virtually any damage caused toteeth are permanently irreparable by natural means. Which is quitestrange, given how fragile a set of human teeth is, be it chemicalor physical damage. Especially if you take more "artificial" causesinto account. A moderately heavy object aimed towards a humanmouth, for example, can easily render ten to fifteen teethpermanently damaged past the point of recovery within a heartbeat,also causing the said person's digestive process to be heavilyimpaired.

Another strange fact worth noting, is that the human body iscapable of producing two separate set of teeth due to biologicalgrowth and size differences, but not more than that. Wouldn't it bebeneficial for a biological body to be able to supply new teeth inthe place of ones that have been damaged or removed? One couldargue that such an action would be too complex and impossible,similarly to growing back an entire limb or a spare heart, butgiven the material that makes up teeth and its fragile nature, itwould be safe to assume that it is biologically possible,especially given the fact that the human body DOES produce twoseparate set of teeth over its lifespan.

However, even stranger still, is that the only element capableof damaging or deteriorating teeth by natural means, is theconsumed food itself, and the acidic bacteria foundwithin. Several types of edible food consumable by human means arecapable of damaging the enamel to critical levels within relativelyshort periods of time, even non-artificial ones. What happenedbefore the invention of the toothbrush and various dental cleaningmethods? Why haven't humans evolved in the past tens of thousandsof years to the point where repairing or regrowing teeth by naturalmeans is feasible? Simply put, why don't teeth grow back contraryto hair, nails or skin?

What is the biological and evolutionary reason behindteeth being so fragile and indisposable?

Many advances in genetic engineering, primarily thanks to the federally backed Human Genome Project, are allowing human beings to affect their natural skills and abilities.While the most obvious and practical use of genetic information is its application to genetic disorders, other uses and abuses of genetic technology are present. For example, the marketing of genes by young women who are donating their eggs to infertile couples and/or brokers.According to the CDC's 2013 report (Centers for Disease Control), there are approximately 467 clinics in the United States and in the same year 1.5% of all infants born in the U.S were conceived using ART (Assisted Reproductive technology). In these clinics, a young woman can donate eggs from her ovum and receive compensations between$5,000 and $10,000. While compensations above $10,000are generally considered unethical, young women who have attended Ivy League schools are especially sought after because of the strength of their genetic heritage and may receive as much as $50,000 from prospective parents and brokers.

Genetic information, knowledge and practice will not regress. The world is going to move forward with many applications of such knowledge. Given this, discuss the moral and ethical implications of the current and future uses of genetic databases. What are the advantages of such databases? What are the disadvantages? In your research/literature based opinion, how should/could the databases be managed in order to maintain ethically sound conditions?

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