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Monday, April 24, 2017

Contest Ends on Friday, May 5th


Student submissions for the new blog header must be received by the teacher by 3:20 pm on Friday, May 5th. You may submit these on a USB drive or by e-mail.

The guidelines are written in the class notes section of your Technology-STEM Discovery notebooks. The name of the school or the school logo must appear on the header. Also the header should have the name of the course: Technology-STEM Discovery, with emphasis on the word "discovery."

The submission will be shown to the 7th and 8th grades classes and the students will vote for the top three headers. Those headers will be improved, based on suggestions from the teacher and classes, and then a second vote will determine the top choice. The creator of the top choice will receive a $75.00 gift card.

If you have questions, see Ms. Linsley.


Related reading: Designing a Blog Header on Google;




Wednesday, April 19, 2017

Brick Making in the Ancient World


Unexcavated brick wall at Harappa in India.


Brick makers were a skilled class of people in the ancient world. They served the regional chiefs who constructed fortifications, palaces, and pyramids. 

Mud bricks date back to Mehrgarh (4500 B.C.), and baked bricks were a hallmark of the Indus Valley Civilization. Archaeologists have found clay or mud brick structures, often in ruins, dating to as early as 4800 B.C.

The bricks were pressed into molds and then dried in the sun or baked in ovens (kilns). The molds made it possible to produce bricks that were uniform in size and shape.




Baked bricks form this fortification wall. The strength and height are increased by alternating rows of bricks running in different directions.

Kiln-baked bricks were stronger and were used for the outer defensive walls and for structures near flood zones. 

Brick kilns (shown below) were discovered at Egyptian Teudjoi (Ankyronpolis) south of Beni Suef, on the east bank of the Nile. 




Genesis 11:3 tells us that the towers in Mesopotamia were built of fired brick. Mud or clay bricks were used to build temples, palaces, entrances to royal tombs, houses, walls, and pyramidal towers called ziggurats. The Mesopotamian ziggurats were built with a core of sun-dried mud brick and an exterior covered with kiln-baked brick. The term "ziggurat" comes from the Akkadian word ziqqurratu, which is translated as "rising building" (from the ancient Akkadian zaqâru, "to rise high").

The Sumerians used bricks to create arched entrances to royal tombs. Sumerian arches were made by stacking bricks on top of each other in steps that met in the center. Around 3000 B.C, builders created a special wedge-shaped brick mold that allowed the bricks to fit even more closely together above a doorway.

The Sumerians and ancient Egyptians built shrine cities and fortifications using clay bricks mixed with straw. According to Exodus 5:7, Pharaoh ordered the Egyptian taskmasters: "You are no longer to supply the people with straw for making bricks; let them go and gather their own straw."




To increase the brick production teams of brick makers competed against each other. This image (above) of men making bricks appears on the wall of the tomb of Rekmara, a ruler of the Eighteenth Dynasty (1550-1292 BC). 

The land of Canaan and its principal cities, such as Hazor, Kadesh, and Jerusalem, were under Egyptian rule during the Eighteenth Dynasty. Cities under Egyptian rule were fortified with walls many feet thick. The north wall protecting Lachish was 17 feet thick and the outer walls of Gezer were 14 feet thick. These fortified shrine cities are called the "high places" in the Bible. Jerusalem was named Jebus because it was the city of the Jebusites who built their royal complex on the south-eastern hill of Jerusalem. The old Jebusite wall was made of stone. Most monuments and fortification walls built by high kings were made of stone.

Bricks were used to lay out the structure of a new building. Stacked bricks served as markers. Some buildings contained bricks that were inscribed with prayers and dedications, as is done today on the corner stones of many public buildings and churches.


Homo Naledi: another member of the human family


Archaic human bones found deep in a cave in South Africa show the full range of human physical features and are dated between 335,000 and 236,000 years ago.

The bones found in the Dinaledi Chamber represent the largest collection of human bones found in Africa. The bones are of 15 individuals, including infants, children and adults. (For more, read about the Rising Star Expedition.)




The Naledi hand and modern human hand are virtually identical, as can bee seen below.



The cave appears to be a site of ritual burial.

Friday, April 7, 2017

Enevoldsen's Periodic Table Highlights Uses



In high school chemistry we learn the periodic table, but rarely do we learn how these elements are used. Keith Enevoldsen from elements.wlonk.com has come up with this awesome periodic table that gives you an example for every element except for the superheavy elements that do not occur in nature and can only be produced in the laboratory. Such elements are discovered by smashing together light nuclei and tracking the decay of the resulting superheavy elements.

Uranium was used to create "vaseline" glass and is moderately radioactive. This green-yellow glass is a popular collectable. Thulium is used for laser eye surgery, krypton for flashlights, strontium for fireworks, and xenon for lighthouse lamps. Samarium is used with cobalt to make magnets.

Discover more uses here.

Related reading: Element 117 Named; Four Newly Named Elements

Thursday, April 6, 2017

The Judean Palm


When the Romans invaded Judea in 63 B.C., there were thick forests of date palm trees stretching over a range of 7 miles across the Jordan valley from the Sea of Galilee in the north to the shores of the Dead Sea in the south. The trees grew to a height of 80 feet and had branches all year round.

When the people greeted Jesus as he entered Jerusalem, they greeted him with palm branches as a king to be enthroned. Ceremonial installation of rulers with palms was an ancient tradition in Jesus' time. Fresh palms are still used among many peoples of Central and East Africa at the enthronement of a sovereign and a priest of high rank.

In greeting the King, palm fronds and olive branches were used in Biblical times among the Jebusites who controlled Jerusalem (Yebu). Even today. fresh palm tree fronds are used ceremonially at the installation of Ijebu rulers and to decorate places of worship. Jude Adebo Adeleye Ogunade writes in his memoir about growing up Ijebu. He was warned not to touch the leaves of the Igi-Ose tree because, as his Mama Eleni explained, "That tree is the tree whose leaves are used to install Chiefs and Kings of Ijebu and as your grandfather was a custodian of the rites of chieftaincy and kingship you must not play with its leaves." The University of Oxford, Institute Paper, n° 7, (1937) on Medicinal Plants lists the leaves of the Igi-Ose as a blood purifier.

Palm branches were also used to decorate sacred places and in worship. Watch this video of Christian women worshiping with palm branches.

In ancient Israel the Judean nut palms were stripped of many branches for the Jewish festival of Tabernacles or Booths (Sukkot). Branches were cut to make roofing for the booths. The palm branches also were used to thatch the roofs of homes and sheep cotes, to create canopies over open market spaces, and for ceremonies like weddings, etc. They were used so extensively that the Judean date nut palms disappeared from the Jordan valley.

Hayany Date Nut Palm of Upper Egypt

There are efforts to bring back the Judean nut palm. In 2005, Dr. Elaine Solowey germinated a 2000-year seed that had been recovered decades earlier from an archaeological excavation at the fortified high place Masada. The so-called "Methuselah Tree" (shown below) is growing in a protected environment at a laboratory in Jerusalem. Genetic tests indicate that Methuselah is closely related to an ancient variety of date palm from Egypt known as Hayany (shown above). The ancient flora and fauna of the Jordan Valley and the Nile Valley are similar.

Ten years after sprouting from the ancient seed, the Methuselah date palm is now producing dates. These are the kind of palm branches that would have been used to hail King Jesus as he entered Jerusalem.

The Methusleah Tree


In the ancient world palms grew in arid regions at oases. These trees provided shade for those who lived at the oasis and the dates were eaten and used to sweeten foods. Dried dates were used to make date cakes and these were usually eaten at celebrations. At Bedouin weddings guests are typically served dates and Arabic coffee as they arrive for the days-long celebration. According to 1 Chronicles 16:3, after David had finished sacrificing the burnt offerings, he blessed the people in the name of the Lord, and distributed to each person a date cake.

Tuesday, April 4, 2017

Georges Cuvier


Georges Cuvier
1769-1832

"Why has not anyone seen that fossils alone gave birth to a theory about the formation of the earth, that without them, no one would have ever dreamed that there were successive epochs in the formation of the globe." -- Georges Cuvier, Discourse on the Revolutions of the Surface of the Globe


Davis Jones
Grade 7

Mary Anning (1799-1846) has been called "The Greatest Fossilist" in the world. She explored the cliffs of Lyme Regis in Dorset, England, where she collected fossils. She spent more than 30 years collecting and describing fossils found mostly in rocks of the Jurassic age. Anning discovered fossils that she later described as a plesiosaur, an early marine reptile. The discoveries of Anning and the French naturalist, Georges Cuvier, provided a better understanding of organic life in the Jurassic age.

If  Mary Anning is the "mother" of paleontology, Georges Cuvier is certainly the "father" of paleontology. Besides their love of fossil hunting, they shared the Christian Faith. Both made important discoveries and confronted opposition based on limited religious beliefs. Anning faced a challenge from Christians who believed that the earth is only about 6000 years old. She considered that many of the fossils she found were older than 10,000 years. Anning’s work helped to change the way people thought about prehistoric life on Earth.

Georges Cuvier proposed that there had been an "age of reptiles" before the time of mammals. This idea of earth’s organic life changing over time presented a challenge to the Young Earth Creationism of the churches in Cuvier’s time. Cuvier was a Lutheran who regarded his faith as a private matter. He supervised government educational programs for Protestants in France and was instrumental in founding the Parisian Biblical Society in 1818. From 1822 until his death in 1832, Cuvier was Grand Master of the Protestant Faculties of Theology of the French University in Paris.

Cuvier served in Napoleon's government and served under three successive Kings of France. He was knighted and made a Baron and a Peer of France. He was respected for his devotion to science. His contribution to understanding vertebrate and invertebrate zoology and paleontology is significant.




Cuvier is credited with demonstrating the reality of extinction over time. However, he did not believe extinction confirmed Darwin's evolutionary theory. Instead, he believed that all species were created around the same time in the past and that some species became extinct due to natural causes such as environmental catastrophes.

Related reading: Baron Georges Cuvier