The atomic number of the periodic table directly corresponds to the number of protons which is in the atom. Once another proton is added, it is no longer the same element. The same cannot be applied to when another neutron or another electron is added. Adding more electrons will give the atom a negative charge and removing electrons will give the atom a positive charge. Metals tend to lose electrons, which creates a positive charge. Non-metals tend to gain electrons, forming a negative charge. Electrons are the foundation for determining how compounds are formed amongst atoms. Adding or removing neutrons within an atom changes its isotope. As an example, carbon-12 is the most stable isotope for a carbon atom. However, we can add two more neutrons and carbon-12 is now carbon-14, a less stable isotope of carbon. The number of an isotope directly correlates to the atomic mass of an element. The amount of neutrons in any given atom by subtracting the atomic number from the atomic mass.
June 21
In most years, this is the date of the summer solstice in the northern hemisphere, as the day with the most daylight hours. In the southern hemisphere, this is the winter solstice, with the least daylight hours.
1920
Cardinal number
Cardinal numbers (or cardinals) are numbers that say "how many" of something there are, for example: one, two, three, four, five, six. They are sometimes called counting numbers.
The cardinality of a set is the cardinal number that tells us, roughly speaking, the size of the set.
In mathematics, people also study infinite cardinal numbers. The first infinite cardinal number was named formula_1 (pronounced "Aleph null", "Aleph-zero" or "Aleph-naught") by Georg Cantor. formula_1 is the number of numbers that are in the group 0, 1, 2, 3, ... (which goes on forever). Both the set of natural numbers and the set of rational numbers are of size formula_1 (that is, they are both countable).
Another infinite cardinal number is the number of numbers in the set of real numbers, and is represented by the symbol formula_4 (or formula_5, the cardinality of the continuum). Cantor proved that there are many different infinite cardinal numbers that are bigger than formula_1. A famous theorem of Cantor is that the cardinality of the real numbers is larger than the cardinality of the natural numbers. The continuum hypothesis is the statement that there is no middle cardinal number strictly between that of natural numbers and real numbers.
1960
1960 (MCMLX) was .
1956
1956 (MCMLVI) was .
March 4
From 1793 – 1933, March 4 was Inauguration Day for the President of the United States. Since 1937, Inauguration Day has been January 20.
Merchant marine
Merchant marine is a term used in many places to talk about commercial ships and crews. A country's merchant marine is made up of all the ships owned by companies or individuals in that country which are used to make money. Most of a country's merchant marine is usually made of ships that carry things from place to place, like oil tankers and freighters. Other ships, like cruise ships and ferries, are also included because they are used to make money. When a country is at peace, its merchant marine works independently. Some countries, though, require merchant ships to work for their armed forces in times of war.
In the United States, "Merchant Marine" has a different meaning. The United States Merchant Marine (USMM) is a part of the military which is controlled by the government in both peace and war. When the United States is at war, the USMM is used to carry military supplies. In World War II, nearly one out of every twenty-six American merchant mariners was killed, a higher portion of men than in the Army, Navy, or even the Marines.
FreeBSD
FreeBSD is an operating system for many different kinds of computers. This means that if the user has a computer around the house and want to run FreeBSD on it, the user probably can. Computers that run Microsoft Windows will also run FreeBSD. It is based on BSD, the version of UNIX developed at the University of California, Berkeley.
FreeBSD is open source. This means that anyone can download the source code and change, or learn from it. The people who work on FreeBSD do not usually get paid. They keep working on it because they enjoy it or want to become more experienced programmers.
Most open source software that runs on Linux will run natively on FreeBSD without the need for any compatibility layer.
There are a lot of operating systems, which are based on FreeBSD.
Several projects created an operating system, based on FreeBSD, which has a GUI by default.
Examples for that kind of operating systems are:
Garry Marshall
Garry Marshall (November 13, 1934 – July 19, 2016) was an American writer, producer, director and actor.
Marshall wrote for comedians Joey Bishop and Phil Foster. Soon he moved on to writing for television series, including "The Dick Van Dyke Show" and "The Tonight Show". In 1970, he adapted the Neil Simon play and 1968 movie "The Odd Couple" into a popular television series starring Tony Randall and Jack Klugman.
It was very successful. Marshall worked on "Happy Days", "Laverne and Shirley" (which co-starred his sister Penny), and "Mork and Mindy". Both of there were spin-offs from "Happy Days" and just as successful and well-known. He directed and acted in several movies including "Pretty Woman" and "Runaway Bride".
Marshall also ran and works out of a local community theatre house in Los Angeles, The Falcon Theatre.
On the morning of July 19, 2016, Marshall, aged 81, died at a hospital in Burbank, California, due to complications of pneumonia after suffering a stroke.
1934
November 1
Johnny Weissmuller
Johnny Weissmuller (June 2, 1904 – January 20, 1984) was a German-American swimmer and actor. He was born in Timisoara, Austria-Hungary to German parents.
He was one of the world's best swimmers in the 1920s. He won five gold medals and set five then-Olympic records in swimming competitions at the Olympics in 1924 and 1928, and a bronze medal in water polo at the 1924 Olympics.
He later played Tarzan in a series of movies in the 1930s and became a movie star. This made him a character actor. He then had trouble getting parts in other movies because of this.
On January 20, 1984, Weissmuller died of pulmonary edema. He was 79. He was buried in Acapulco, Mexico, where he was living when he died. At his funeral, a sound recording of the "Tarzan yell" he had made famous in the movies was played three times, at his request.
1756
1715
In 1715 lots of people who didn't like king George I of Great Britain rebelled in Scotland. These people were the Jacobites and they wanted James Francis Edward Stuart to be king instead of George I. Their luck was going well at first when they managed to take control of most of Scotland but the British Army came in and they lost.
Priscilla Presley
Priscilla Presley (née Wagner) is an American actress. She is the former wife of Elvis Presley and is the mother of Lisa Marie Presley. Presley is probably most famous for her roles in the television primetime soap opera "Dallas", and "The Naked Gun" movies with Leslie Nielson. She is also a member of Scientology.