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Puerto Rico is an island located in the north eastern Caribbean, east of the Dominican Republic. Puerto Rico also includes some surrounding islands including Vieques, Culebra, and Mona. Puerto Rico has a population of approximately 3,725,789 and a land area of 9,104 km2 (3,515 sq mi.). The capital city of Puerto Rico is San Juan and half of the population of Puerto Rico live and work in this city.
A microscope is a specialized scientific instrument that is used to study objects that cannot be seen by the naked human eye. The most well known type of microscopes use a glass lens to magnify the size of an object so that it can be observed. They often make use of light to illuminate the subject of study. They can also be adjusted for different views and magnifications. There are many types of microscope including the optical microscope, electron microscope and the scanning probe microscope. Let’s take a look specifically at the invention of the optical microscope.
A fluorescent light consists of long tubular globes and a light fixture. Fluorescent tubes have capped ends with two external pins. They are coated inside with phosphorus and filled with argon gas and a small amount of mercury. They are more energy efficient that normal incandescent globes and are often used in places where bright light is required. Office buildings and schools often use Fluorescent lighting for these reasons and many people install fluorescent lighting on their porch, in their garages or in their kitchens to provide strong lighting for those areas. Fluorescent lights work in a different way to the standard incandescent bulb. Read this article to learn more about how they work.
Helium Balloons are a popular decoration at many events, such as birthday parties and weddings. They are also popular with children, who enjoy holding them (and letting them go). When a helium balloon is released it floats and rises in the air. Have you ever wondered why this occurs? Read this article to find the answer.
Whistler’s Mother, official title Arrangement in Grey and Black No.1, is one of the most famous paintings in American art. It is an oil on canvas painting that depicts the painters mother sitting on a chair. It gained fame in the United States at the Chicago World’s Fair and became a symbol of motherhood and family values. It is currently owned and displayed by the Musée d’Orsay, which is a museum in Paris. It has toured worldwide on occasion, and sometimes appears in America for a short public viewing. If you have ever wondered who painted this iconic painting, keep reading to find out.
Leprosy, also known as Hansen’s disease after the physician who identified the cause, is a disease that is best known for causing skin lesions that often appear as deformations or growths. If it is untreated the disease commonly progresses and leads to permanent disfiguration and damage to the eyes, skin, nerves and limbs. Evidence for this disease dates back to at least 4000 years ago and it has affected many people and civilizations through the years. Leprosy drugs are now available to cure this disease, but in the past those suffering leprosy were quarantined or segregated in leper colonies and some of these still exist today.
The state of Pennsylvania, full name Commonwealth of Pennsylvania, is located in the northeastern region of the United States of America. It is bordered by Delaware, Maryland, West Virginia, Ohio, New York, New Jersey and Canada. Although it is the 33rd largest state in the country it is the 6th largest state by population with an estimated 12.7 million people. The largest city in the state is Philadelphia with about 6 million people residing within the metropolitan area. The state of Pennsylvania played host to many of the important events in early US history. Let’s take a look a brief history of the formation of the state Pennsylvania.
The President of the United States of America is the head of government and head of state. The President has many important roles including the leader of the executive branch of the government and is the commander-in-chief of the armed forces. Although the President of the United States has always been an important position, today it is widely regarded as the highest position of power in the world. The vast majority of Presidents have been over 50 years of age at the time of inauguration, but 9 Presidents have been under this age. If you have ever wanted to know which person was the youngest ever President, keep reading to find out.
Quentin Tarantino is best known as a celebrity director who burst onto the scene with the hit movie “Reservoir Dogs” in 1992. His career took off from this point and he has worked on a number of hit movies. He has also won many awards, including an Academy Award in 1995. Apart from his directing he has also appeared in front of the camera in a number of roles and he has written and produced a number of films and television shows. The following is a list of movies that Quentin Tarantino has directed, acted in, written or produced.
The Walt Disney Concert Hall is located in Downtown Los Angeles, California. It was built between 1999 and 2003 with a total cost of $130 million. The hall seats 2,265 people and it is a part of the Los Angeles Music Center. It is used for many musical events and it is the home of the Los Angeles Master Chorale and the Los Angeles Philharmonic orchestra. The Walt Disney Concert Hall has one of the most unique designs of any concert hall in the world. If you want to know who designed it, keep reading to find out.