River dolphins are five species of dolphin which live in fresh water rivers and estuaries. Three species live in fresh water rivers. The La Plata Dolphin lives in salt water estuaries and the ocean.
Both river dolphins and marine dolphins belong to a group of mammals called cetaceans. The snout of a river dolphin measures about 58 centimeters (2 ft) long, approximately four times as long as that of most marine dolphins. They use their long snout to search for fish on the muddy bottom of the river. River dolphins have smaller eyes than marine dolphins, and their vision is poorly developed because they live in dark, muddy water. River dolphins are less active than marine dolphins because they do not need to search so widely to find fish. Marine dolphins work in pods (packs) because when they find a shoal of fish then they work together to make the most of their find. River dolphins work mostly as individuals or small groups.
The following is the taxonomy of river dolphins, or how dolphins are classified:
River-Dolphins-and-their-habitat
Estuary
An estuary is where a river meets the sea. There, saltwater mixes with freshwater. The river becomes wider and wider and flows slowly to the ocean.
Bays, marshes, swamps, and inlets can all have estuaries. A view of an estuary from the air is usually an interesting sight: many estuaries meander (curve and bend) to find their way to the sea. Estuaries come in all sizes and shapes, each according to its location and climate. Where rivers meet the sea and fresh water mixes with salt water, the mixture is called brackish water.
Some estuaries are very large. They may be large ocean bays that have more than one river flowing into them. For example, Chesapeake Bay is a large estuary, and several different rivers meet the Atlantic Ocean there.
In simple terms it is where a river meets with a large body of water only with ((one)) outlet and not many like a ((delta)).
Estuaries are usually filled with shallow waters, and sunlight reaches all levels of the water. Marsh grasses, algae, and other kinds of plants live in estuaries and provide food for a variety of fish, crabs, oysters, and shrimp. Estuaries are especially important since they act as nurseries for many different types of young fish and other animals before they head out toward the open ocean. Many sea birds also nest in estuaries.
The United States government has a program to study and protect the natural environment in many different estuaries, called the National Estuarine Research Reserve System. One reason that the natural environment in so many estuaries is in danger is because they are also good places for people to live and build cities. Unfortunately, many of world's largest cities are at or near estuaries.
James Bond
James Bond is a fictional British spy created by Ian Fleming in 1953.
In 1953, Fleming wrote "Casino Royale", the very first James Bond novel. The novel made a lot of money, and he continued to write one James Bond novel each year until he died in 1963. In a 1956 South African radio program "Moonraker" he was voiced by Bob Holness. In 1962 Albert. R. "Cubby" Broccoli and Harry Saltzman started to produce the first James Bond movie, Dr. No, starring Sean Connery as James Bond. The movie became extremely popular, and they continued to make more Bond movies. In the end of the 1960s Connery did not want to do any more Bond movies, and many thought that Bond was now dead. In 1969, George Lazenby appeared in one movie as the Bond character, but the movie was not successful.
In 1971 Sean Connery stepped back into the role for one movie "Diamonds are Forever". After this in 1973, producers came up with the "Live and Let Die" movie, starring Roger Moore as Bond. The movie became a very big success. The series continued throughout the 1970s and 1980s with Roger Moore playing the role of Bond.
In the 1980s, Bond movies were not as successful at the box office. Unlike the 1960s and 1970s, in the 1980s there were many other action movies being produced that could compete with the Bond series.
After Moore left the role as Bond, he was replaced with Timothy Dalton in the late 1980s. Dalton tried to make a serious, "down to earth" Bond, closer to the Fleming novels. Fans did not like Dalton's interpretation of the Bond character, and the movies made little money.
The Cold War ended in 1991. Since Bond almost always fought Communists, many now thought that the Bond series of movies was finally dead.
In 1995, producers developed the Goldeneye movie, starring Pierce Brosnan as Bond. This film made the Bond character well known in the 1990s. Brosnan appeared in several Bond movies.
In 2002, the James Bond character was used in the 20th movie, Die Another Day, the 40th anniversary of the movies and the 50th anniversary since Fleming wrote his first Bond novel.
In 2006, the 21st movie, Casino Royale, was released. Pierce Brosnan, who played James Bond in the previous four movies, was replaced by Daniel Craig, the first James Bond to have blonde hair. The movie is based on the first Ian Fleming novel of the same name, but is set in the present day. The movie features a cameo appearance by Richard Branson, a British billionaire. It has a new model of Aston Martin DB9, the car that made James Bond so famous in the 1960s. Many fans think that whilst this movie is different than other movies, it is much better, and movies in the future (however few there will be) will be in this new format. In 2008, Craig appeared in a second Bond movie, "Quantum of Solace" and a third, "Skyfall", in 2012. His fourth appearance as Bond was with "Spectre" in 2016. His fifth and final appearance as Bond is with "No Time to Die" in 2021.
Many of the James Bond movies were massive hits. However, there are two movies classed as unofficial Bond films and not recognised as part of the series. The 1967 version of "Casino Royale" was a spoof, featuring "Jimmy Bond". Also, "Never Say Never Again" was not made by Albert R. Broccoli's production company, EON Productions. Connery is the tallest actor to play James Bond to this day.
A Streetcar Named Desire (1951 movie)
A Streetcar Named Desire is a 1951 movie. It is based on the 1947 play by Tennessee Williams. The movie stars Marlon Brando and Vivien Leigh.
Tetrahedron
A tetrahedron (triangular pyramid) is a three-dimensional shape. It has four corners. It looks like a pyramid. It has six equally long edges, four corners and four equilateral triangular faces. Every two edges meet on one of those corners forming a sixty-degree angle. All of its sides are triangles.
A regular tetrahedron is a tetrahedron where all of its edges are the same length. If the length of an edge is "a":
Robert Hooke
Robert Hooke FRS (Isle of Wight, 18 July 1635 – London, 3 March 1703) was an English naturalist, architect and polymath. Hooke played an important role in the birth of science in the 17th century with both experimental and theoretical work. He was a colleague of Robert Boyle and Christopher Wren, and a rival to Isaac Newton. Hooke was a leader in the plans to rebuild after the Great Fire of London in 1666.
There is no surviving portrait of Hooke.
He discovered Hooke's Law of elasticity. He designed and ordered the making of telescopes and microscopes, and used both instruments. He reported on this work in a book called "Micrographia" in 1665. He was the first person to see biological cells. He made drawings of bodies in the Solar System, and made the first attempts to measure the distance of certain stars.
Robert Hooke was appointed the Royal Society's first Curator of Experiments in 1662, and he rose to be Secretary of the Royal Society. He took responsibility for experiments performed at its weekly meetings. This was a position he held for over 40 years.
In 1664 Hooke also was appointed Professor of Geometry at Gresham College in London and Cutlerian Lecturer in Mechanics.