Though the term blackboard has a color in its name, most of them
are now not actually black. We still use the term
interchangeably with chalkboards. Now they are more often green.
A few hundred years
ago, blackboards were black. They were large boards of connected
slates that teachers could write on for the whole class to see.
The name blackboard was not used until 1815. They were usually
made with slate, but in rural areas, they were often wooden
boards painted dark with egg whites mixed with the remains of
charred potatoes. Later, they were also made of wood darkened
with a commercially made porcelain-based ink.
During the 20th
century, manufacturers began to make chalkboards using a green,
porcelain enameled paint on a steel base. By the 1960s, the
green chalkboard trend was becoming universal. Teachers had
discovered that a different colored paint was a lot more
comfortable to stare at all day, because green porcelain paint
cut down on glare.
During the 1990s,
schools began converting their classrooms to whiteboards, which
produce less dust and eliminate that telltale screeching noise.
Oct 6, 2017
Cancer Stages and Grades
Cancer is the name given to a collection of
related diseases. In all types of cancer, some of the body’s
cells begin to divide without stopping and spread into
surrounding tissues.
Too many of us are aware of the prevalence of cancer in our society. Two words often come up, but are not universally understood. Staging is for the cancer itself and grade references the actual tumor. There are different grading systems for different types of cancer. For instance, there is Gleason for prostate cancer, Bloom-Richardson for breast cancer, Fuhrman for kidney cancer, etc.
Cancer stage refers to the size and/or reach of the original (primary) tumor and whether or not cancer cells have spread (metastasized) elsewhere in the body. Stages do not change from initial diagnosis, even if the cancer becomes more aggressive. This is important for consistent statistical analysis.
Stage 0 (zero) Abnormal cells are present, but have not spread to nearby tissue. Stages I, II, and III indicate cancer is present. The higher the number, the larger the cancer tumor and the more it has spread into nearby tissues. Stage IV shows the cancer has spread to distant parts of the body.
Staging is usually based on the TNM system of classifying cancer. In the TNM system, each cancer is assigned a letter or number to describe the tumor, node, and metastases. T stands for the original (primary) tumor. N stands for nodes and tells whether the cancer has spread to the nearby lymph nodes. M stands for metastasis.
Tumor grade is the description of a tumor based on how abnormal the tumor cells and tumor tissue looks under a microscope. There are four grades G1 Well differentiated (low grade), G2 Moderately differentiated (intermediate grade), G3 Poorly differentiated (high grade), and G4 Undifferentiated (high grade). Grade 3 and 4 tumors tend to grow rapidly and spread faster than tumors with a lower grade.
Low-grade cancer cells look more like normal cells and tend to grow and spread more slowly than high-grade cancer cells. Cancer grade may be used to help plan treatment and determine prognosis.
In addition, there are two tumor types, benign, such as moles and warts and malignant, where the cells invade the surrounding tissue and organs.
Generally, there are five cancer stages, four tumor grades, and two tumor types, benign and malignant. Unlike school, a high stage or grade is not good.
Too many of us are aware of the prevalence of cancer in our society. Two words often come up, but are not universally understood. Staging is for the cancer itself and grade references the actual tumor. There are different grading systems for different types of cancer. For instance, there is Gleason for prostate cancer, Bloom-Richardson for breast cancer, Fuhrman for kidney cancer, etc.
Cancer stage refers to the size and/or reach of the original (primary) tumor and whether or not cancer cells have spread (metastasized) elsewhere in the body. Stages do not change from initial diagnosis, even if the cancer becomes more aggressive. This is important for consistent statistical analysis.
Stage 0 (zero) Abnormal cells are present, but have not spread to nearby tissue. Stages I, II, and III indicate cancer is present. The higher the number, the larger the cancer tumor and the more it has spread into nearby tissues. Stage IV shows the cancer has spread to distant parts of the body.
Staging is usually based on the TNM system of classifying cancer. In the TNM system, each cancer is assigned a letter or number to describe the tumor, node, and metastases. T stands for the original (primary) tumor. N stands for nodes and tells whether the cancer has spread to the nearby lymph nodes. M stands for metastasis.
Tumor grade is the description of a tumor based on how abnormal the tumor cells and tumor tissue looks under a microscope. There are four grades G1 Well differentiated (low grade), G2 Moderately differentiated (intermediate grade), G3 Poorly differentiated (high grade), and G4 Undifferentiated (high grade). Grade 3 and 4 tumors tend to grow rapidly and spread faster than tumors with a lower grade.
Low-grade cancer cells look more like normal cells and tend to grow and spread more slowly than high-grade cancer cells. Cancer grade may be used to help plan treatment and determine prognosis.
In addition, there are two tumor types, benign, such as moles and warts and malignant, where the cells invade the surrounding tissue and organs.
Generally, there are five cancer stages, four tumor grades, and two tumor types, benign and malignant. Unlike school, a high stage or grade is not good.
Sep 29, 2017
National Coffee Day
Today is National Coffee Day, go out and get a free cup
of coffee today at your favorite Dunkin Donuts, Krispy Kreem,
Tim Horton's, and other places - but not Starbucks.
What's in a Name, Duct Tape
It was invented by Johnson
& Johnson during World War II. Their original creation for
the United States military was a green waterproof tape that
could be used for sealing ammunition cases to keep water out.
Soldiers soon learned the tape was good at fixing any type of rip or tear they might encounter for tents, vehicle seats, and even uniforms. After the war, returning soldiers introduced it to friends and neighbors back home.
One of the first uses for the tape was to repair or seal the ductwork in home heating and cooling systems. To match the color of ductwork, the company changed the color of the tape to silver and began to call it duct tape.
Many people believe that the tape was called duck tape, because its ability to repel water reminded of the similar property of duck feathers. There is a brand of tape named Duck tape that is sometimes confused with the original.
Duct tape comes in many different colors, although the most popular are silver and black. It is so strong, because it is made of three different layers. The bottom layer is a strong rubber-based adhesive. The middle layer is a web of cloth fabric that adds durability. The top layer is soft, waterproof plastic.
Soldiers soon learned the tape was good at fixing any type of rip or tear they might encounter for tents, vehicle seats, and even uniforms. After the war, returning soldiers introduced it to friends and neighbors back home.
One of the first uses for the tape was to repair or seal the ductwork in home heating and cooling systems. To match the color of ductwork, the company changed the color of the tape to silver and began to call it duct tape.
Many people believe that the tape was called duck tape, because its ability to repel water reminded of the similar property of duck feathers. There is a brand of tape named Duck tape that is sometimes confused with the original.
Duct tape comes in many different colors, although the most popular are silver and black. It is so strong, because it is made of three different layers. The bottom layer is a strong rubber-based adhesive. The middle layer is a web of cloth fabric that adds durability. The top layer is soft, waterproof plastic.
Lake Baikal
If the rest of the planet’s fresh water
disappeared, there would be enough left in Lake Baikal, Russia
to supply humanity for 50 years. It is world's oldest (25
million years old) and deepest (over a mile deep) freshwater
lake and contains about 23% of the world's fresh surface water.
In Mongolian it means "the Nature Lake." Appears the screams
about running out of fresh water are a bit premature.
Alcatraz
Its name came from Spanish explorer Juan Manuel de Ayala in
1775: La Isla de los Alcatraces or "Island of the Pelicans."
In 1850, US President Fillmore converted the island to military use. A fortress was built, cannons were installed, and the West Coast's first operational lighthouse was constructed.
The US Army also began to use Alcatraz to house military prisoners. It was the perfect spot for a prison, because it was isolated and everyone assumed no prisoner could successfully escape by swimming across the frigid waters of San Francisco Bay.
During the early 1900s, military prisoners helped to build a new, 600-cell jail, as well as a hospital, cafeteria, and other prison buildings. Over time Alcatraz was transferred to the US Justice Department for use as a federal prison for prisoners too dangerous to be kept at other penitentiaries. Alcatraz usually held between 260-275 prisoners. Each prisoner had his own cell, and there was one guard for about every three prisoners.
There were 14 known escape attempts involving 36 prisoners. Of those attempting to escape, 23 were captured, six were shot and killed during their attempt, two drowned, and five went missing and were officially presumed dead.
Alcatraz was shut down during 1963, because it was too expensive to keep operating. Now it is thriving again as a tourist attraction.
In 1850, US President Fillmore converted the island to military use. A fortress was built, cannons were installed, and the West Coast's first operational lighthouse was constructed.
The US Army also began to use Alcatraz to house military prisoners. It was the perfect spot for a prison, because it was isolated and everyone assumed no prisoner could successfully escape by swimming across the frigid waters of San Francisco Bay.
During the early 1900s, military prisoners helped to build a new, 600-cell jail, as well as a hospital, cafeteria, and other prison buildings. Over time Alcatraz was transferred to the US Justice Department for use as a federal prison for prisoners too dangerous to be kept at other penitentiaries. Alcatraz usually held between 260-275 prisoners. Each prisoner had his own cell, and there was one guard for about every three prisoners.
There were 14 known escape attempts involving 36 prisoners. Of those attempting to escape, 23 were captured, six were shot and killed during their attempt, two drowned, and five went missing and were officially presumed dead.
Alcatraz was shut down during 1963, because it was too expensive to keep operating. Now it is thriving again as a tourist attraction.
Hack the Fast Food Menus
We have all heard about some secret menu items at
our favorite fast food places. Did you know you can get a spam
and egg McMuffin at McDonald's in Hawaii? Here is a site that
shows 20 secret menus from the popular franchises. Enjoy
something different to spice up your life. LINK
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