Biology 10, Lesson 170 – Bone Marrow

When you think of your bones you probably imagine them as the hard, white things in your body that keep you upright.  But have you ever thought about what your bones are made up of?

Our bones are so much more complex than you can imagine.  Each bone is made up of an intricate matrix of collagen, calcium, and phosphorus.  We also have thousands of cells and nerves inside of our bones.  This is why we feel pain if we hurt or damage the bone.

You have probably heard the words ‘bone marrow’ before, but I doubt you truly understand what it is.  I am sure you can imagine how crucial bone marrow can be to our bones from the name.  Bone marrow is found in long and flat bones like our shoulders, hips, and ribs.  There are two types of bone marrow in our bodies: red marrow and yellow marrow.

Red marrow creates red blood and stem cells, which can be made into osteoblasts.  Osteoblasts are ‘immature’ bone cells that help create the minerals our bones are made out of.

Yellow marrow is mostly made of fat cells and do not do much.  Their only job is to support the red marrow’s activity.  Something interesting to take note of is the yellow marrow’s ability to turn into red marrow.  If you have a serious injury, like a gun wound, and you lose a lot of blood, the yellow marrow will convert itself into red marrow to create more red blood cells to help make up for the loss of blood.

As you can see, bone marrow is a really interesting and crucial part of our bones.  Like many children my age, I have heard the term before on TV shows, but I have never considered what it may be and why it is important.  The human body never ceases to amaze me with how important every little cell and fluid is to our everyday functioning.

Thanks for reading!

Western Civilization 10, Lesson 75, Essay 2 – The Romans and the Visigoths

This week in class, I spent a lesson learning about the Visigoths and their brief, but catastrophic history with the Romans.  When the Romans ruled the world as the strongest empire, they had many admirers, one being the “barbarians”, like the Visigoths.  In this essay, I am going to describe their history and how the Visigoths contributed to the end of the Roman Empire.

“Barbarians” were Germanic tribes that lived outside of Rome.  Despite their label, they were very developed, but not as advanced as Rome was.  The leaders of these tribes held a lot of respect for the Romans and their knowledge and hoped to join the empire through the army.  The various Germanic tribes tried to become a part of the Roman empire, but was rejected every time.

In 376 AD, a tribe known as the Huns attacked and looted the different Germanic tribes.  A certain tribe, known as the Visigoths, desperately asked to join Rome for protection against the Huns.  The Eastern emperor, Valens, allowed the Visigoths in, but not as guests.

Their weapons and children were taken from them, and the Visigoths were treated like animals.  Many families had to make the hard decision of selling their children into slavery for food.

One of the Roman generals was afraid of the Visigoths rising against the Romans as revenge for their poor treatment.  In an attempt to suppress the hostile feelings, the general invited the leader of the Visigoths to a dinner where he would be murdered.

When the Visigoth leader heard of the assassination plan, he urged his people to rebel.  Driven by their hatred for the Romans, the Visigoths destroyed Thrace (modern-day Bulgaria, Greece, and Turkey).  Valens took up arms against the barbarians, but was defeated in the Battle of Adrianople in 378 AD.

Valen’s successor, Theodosius, incentivized the Visigoths to stay calm by giving them army assignments.  But after his death, the Visigoth emperor, Alaric, pillaged Italy in 395 AD.  Theodosius’ successor did not believe in appeasing the Visigoths, leading to the beginning of the Visigoth Rebellion.

Once the Visigoths realized that they would not get the treatment they were used to, they attacked the Romans again.  In a desperate attempt to protect his land, the Roman emperor started pulling troops from the Rhine River frontier, allowing Vandals and other hostile tribes into Rome.  Troops from Britain were also moved to Thrace to fight the various Germanic tribes that had invaded the empire.

By 410 AD, the Visigoths managed to fight their way through Rome to its capital.  Alaric requested to ‘sight-see’ once there.  But when his request was denied, and out of anger, he allowed his men to pillage the city until there was nothing left.  Satisfied, the Visigoths move to Sothern Gaul, then onto Spain where they settled down and created their own kingdom that survived until 711 AD, when the Muslims came along and defeated them.

As you can see, there was no lost love between the Romans and the Visigoths.  While I always believe there are two sides to every story (especially in history), I still think that Valens doomed his empire when he ordered his men to treat the Visigoths to be treated so inhumanly.

Thanks for reading!

Western Civilization 10, Lesson 75, Essay 1 – Christianity Vs Greek and Roman Religion

This week in class, Mr Woods briefly talked about how Christianity departed from the ideals of Greek and Roman religion.  Besides the obvious differences, there were some subtle ones as well that made people start to like Christians over those who still followed the Greek and Roman ways.  In this essay, I am going to talk about these differences. 

The Christians started to gain popularity because of how kind they were. For example, if a Christian helped a poor man on the street by giving him money, the Christian wouldn’t expect anything back in return and they certainly wouldn’t brag about how great of a person they are for doing  a good deed.  But if a person who still followed the Greek and Roman way helped a poor man, they would expect something in return, like a debt that’s expected to be repaid.   This was part of Greek and Roman culture, and was considered normal.  Charity was never truly charity.

The Christians did not participate in infanticide or suicide, something that was very common before Christianity.  The Christians preached about being kind and compassionate to everyone, a complete opposite of what the Greeks and Romans believe in.  If you have ever heard any story about Greek or Roman gods, the common theme is always getting revenge or plotting the downfall of an enemy.

As you can see, compared to the Greek and Roman ideals, the Christians were kind and gentle.  Many started to favor the Christians and their religion which was more caring and empathetic than the tough, ‘dog-eat-dog’ mentality of the Greek and Roman religions.

Thanks for reading!

Western Civilization 10, Lesson 70 – Contributions of the Monks to European Society

This week in class, I spent two lessons learning about monks when monasteries and monasticism first became popular.  Mr. Woods showed me that the monks, who seemed insignificant, actually impacted modern-day European society in subtle, yet big ways.  In this essay I am going to talk about these impacts.

The monks started out as people who wanted to reach a certain level of piety by sacrificing their normal lives.  But over time, they became helpers and teachers to those who lived around them. 

When the government started to falter and taxations became high, the monasteries became places of knowledge for those who wanted to learn real life skills like agriculture and metallurgy.  The monks copied religious and secular documents to preserve them for future generations to read and learn from, and they helped the locals with harvesting their crops and other things that required them to do physical labor.  Because of how involved the monks became in physical labor, people stopped viewing physical work as something to be ashamed of doing.

As you can see, the monks started as people who were seeking a divine life and ended up as helpers to the societies around them.  They helped in big ways, like in the preservation of agriculture and religious texts, and in small ways, like changing people’s views on physical labor. Many historians believe that if the monks never stepped in, we would not have the texts or agricultural knowledge that we do today.

Thanks for reading!

Business 10, Lesson 25 – Cash Vs. Accrual

This week in class, I read Accounting Made Simple by Mike Piper.  In Chapter Nine, the topic of cash accounting versus accrual accounting was discussed.  For a person who wants to start a business, big or small, this is a very important topic to think about.  In this essay, I am going to compare cash and accrual accounting and decide which one is better.

Cash Accounting

Cash accounting is extremely simple, and if you are a teenager who lives with their parents and have no bills to worry about, you probably use this way of accounting.  When using the cash accounting method, revenue is only recorded when cash is received and expenses are only recorded when cash is paid.  This method is great for small, cash based businesses that carry little to no inventory.  It is also very easy to manage, meaning you can take care of it on your own and will not have to spend money on outsourcing the task of bookkeeping.  However, this method does not always show the full picture and open payments will often be forgotten.

Accrual Accounting

Accrual accounting is a little more complicated than cash accounting, but it is still effective.  Revenue is recorded when earned not when cash is received, and expenses are recorded when incurred, not when cash is paid out.  This method does not track cash flow, but it does track open payments, unlike cash accounting.

Example

To make this clearer, imagine you have a lemonade stand and you use the cash accounting method.  You bring 20 glasses to the stand every day and sell each glass for $1.  One day, your friend comes to the stand and asks for 10 glasses of lemonade, but cannot pay you the $10 today.  Your friend promises to pay you back tomorrow, and you agree to sell the lemonade to them.  The day continues and you sell the last ten glasses before going back home.  When you count the money, you see that you made $10 even though you sold $20 worth of lemonade.  Since you have not received the $10 from your friend yet, it does not get accounted for. 

I am sure you can understand how this is not a good accounting method for bigger businesses that deal with more money and inventory.  It is never good to have ‘missing money.’

However, if you used accrual accounting on this situation, you would account for the open payment (the ten lemonade glasses) and your statement would show that you did make $20 for the 20 glasses.

Conclusion

As you can see, both methods have their benefits and their shortcomings.  Personally, I think both methods are good.  If you plan on having a small business and not deal with open payments, the cash accounting method will meet all your needs.  But for bigger businesses that use open payments, it is in their best interests that they use accrual accounting.

Thanks for reading!

English 10, Lesson 80 – Horace’s Personal Views

This week in class, I read the works of Horace, who was a Roman poet.  Like Ovid, it was easy to see his views and opinions through his writing.  In this essay, I am going to talk about his personal views and ethics.

At first, I thought Horace was a pessimistic and moody man who was obsessed with death.  He didn’t seem to view life as anything other than a sport.  The only major and inevitable event in your life is death.  But as I kept reading his works, I realized that he was actually a very sensible man and we share common views. 

The only correct analysis from my first impression of Horace was that he was definitely obsessed with death.  Despite this, he did not seem concerned about legacy and inheritance.  He did not believe in worrying about what happens in the world after you die.  After all, it does not concern you anymore.

Because of his unconcerned attitude to what happens after death, he did not understand why others would kill and lie for wealth.  His view, like mine, was to not equate wealth to your worth and if you somehow found yourself in possession of wealth, do not hoard it.  It will not help you in the afterlife. 

He also had a very strong belief in delivering justice.  He advised to not view other people’s faults too harshly.  Instead, view their shortcomings like you would view your own.  He also believed that punishments against those who broke the law should be fitting.  To deny a just punishment is to deny justice.

As you can see, Horace was a very smart and practical man.  He did not seem greedy or self-absorbed.  Out of all my reading assignments for this class, Horace’s poems were my absolute favorite.  I related to a lot of his views and his poems were beautiful.  Should I be concerned my views align with those of a Roman poet from 2000 years ago?

Thanks for reading!

Biology 10, Lesson 160 – Osmoregulation in Marine Mammals

This week in class I spent a lesson learning about osmoregulation.  In simple terms, osmoregulation is the “maintenance by an organism of an internal balance between water and dissolved materials regardless of environmental conditions.”[1]  In this essay, I am going to talk about osmoregulation of marine mammals.

Every marine mammal lives in different conditions and has different processes of regulating the water and salt in their bodies.  For example, salmons are considered fresh and salt water fish.  The biological term for them is osmoconformer, meaning they can maintain equilibrium in their cells based on their current environment.

But for the marine mammals that are not special like salmon, they have their own struggles.  Saltwater animals have the risk of drinking too much salt and not enough water.  In response, the excess chloride (salt) ions are removed by active transport (the movement of dissolved molecules into or out of a cell through the cell membrane)[2] and leave the body through the kidneys or gills.

On the other hand, freshwater animals have the risk of taking in too much water and not enough salt.  Freshwater animals tend to drink little to no water and urinate frequently to rid themselves of the excess water.  They will then eat salty foods to balance the amount of water and salt in their body.

As you can see, each marine mammal has their own process of balancing out the water and salt in their bodies.  Salmon and other osmoconformer animals truly are fascinating and unique because of their ability to adapt to any environment.  But for the rest of the fish in the sea (and lakes), they will have to work to keep their balance.

Thanks for reading!


[1] Britannica, The Editors of Encyclopaedia. “osmoregulation”. Encyclopedia Britannica, 21 Apr. 2016, https://www.britannica.com/science/osmoregulation. Accessed 5 July 2022.

[2] BBC. “Movement Across Cell Membranes”. BBC. https://www.bbc.co.uk/bitesize/guides/zc9tyrd. Accessed 5 July 2022.

Western Civilization 10, Lesson 65 – Life of the Christians Between Trajan and Constantine

It is no secret that during the years when Christianity was introduced in Rome, it was extremely hard for Christians to live their lives.  In this essay, I am going to talk about what it was like to live as a Christian during the reign of Emperor Trajan (r. 98-117) and Emperor Constantine (r. 306-337).

As evidence, a letter circa 112 AD from Pliny the Younger, a magistrate, to the Emperor Trajan asking him how he should go about his task. Pliny, at that time, was tasked with the job of finding and persecuting Christians. In Trajan’s response letter he reminded Pliny of their policy, which was effectively “don’t ask, don’t tell.” 

Christianity was considered illegal, but the Roman authorities did not actively go out “hunting” for Christians.  If someone was accused of being a Christian, they would be investigated and executed if found guilty. Despite not being hunted for, Christians were still extremely careful in fear of being seen and reported.  From Pliny’s letter, we can see how the Christians had to sneak around to pray and meet.

There is a story that Mr. Woods shared in Lesson 62 that showed how the Romans viewed Christianity during the reign of Trajan.  In the story, a man found his wife in bed with another man.  After that incident, he then found out that she was a Christian.  He told her to continue her affair with the other man because the shame of having a cheating wife was not as humiliating as having a Christian wife.

The persecution of Christians continued until 312 AD when Emperor Constantine halted all executions and punishments.  A year later, in 313 AD, Constantine passed the Edict of Milan, which accepted Christianity as a Roman religion.  Constantine himself was baptised before his death and declared Sunday as a holy day of rest.

As you can see, merely being a Christian during those years was fraught with danger.  If Constantine had not come into power, who knows how long the persecution of Christians may have lasted?

Thank for reading!

Business 10, Lesson 20 – My Favourite Product Based Business

This week in class, I learned about product and service based businesses and their meanings.  In this essay I am going to talk about my favourite product based business.

Before I begin, I am going to briefly explain what product and service businesses are.  Product based businesses are businesses that sell tangible products to their customers (e.g. bookstores, stationary stores, clothing stores, etc.…).  Service based businesses are those that offer services to their customers (e.g. lawnmowers, pet groomers, electricians, etc.…).  There are also businesses that are product and service based.  The most common example I can think of are restaurants.

When it comes to shopping, I am not very picky.  However, my favourite and most frequented product based business is Kinokuniya.  For those that may not know, Kinokuniya is a Japanese bookstore chain that is spread across Asia.  There are also a few stores in the USA, but the majority of the physical locations are in Asia.

As you can see, product and service based businesses are everywhere.  Next time you go to the mall, try to see if you can find a service based business.  Odds are there are only one or two.

Thanks for reading!

Western Civilization 10, Lesson 60 – Christian Beliefs Vs. Greek Beliefs

This week in class, I learned about the very beginning of Christianity.  A very different topic from the Greek and Roman topics I have been learning about prior to this week.  While watching my video lessons, I noticed that despite all of the differences, there are a few similarities between Christianity and Greek/Roman religion.  In this essay I am going to discuss these similarities.

I am sure that you cannot think of many commonalities between the two religions, and I cannot blame you.  Christianity is a monotheistic religion, meaning followers only believe in and worship one God.  On the other hand, Greek and Roman religions are polytheistic, meaning followers believe in and worship multiple gods.

Despite this, there are a few similarities.  For example, both religions require patience and prayer and are very focused on delivering justice.  Both religions have sets of rules for followers to live by.  But that is where the similarities end.

The Greeks view their gods as strong warriors and attributed human characteristics to them.  The Greeks are very focused on fierceness and strong warriors, which carried over to their religion.  On the other hand, Christians view God as omnipotent and loving.  Their teachings focus on love and peace, very different from the rough view of the Greeks.

As you can see, there a few similarities between Christian and Greek beliefs, but overall, the two religions are very different.  How funny it is that the two religions are so different from one another despite Greek works being heavy influencers over Christian morality.

Thanks for reading!

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