Where do pencil fish come from?

How many species of pencilfish are there in the world?

The 19 currently recognized species in this genus are: Most species are slender, pencil-shaped fish ranging in size from under 1 to about 2 in long. N. marginatus, N. rubrocaudatus, and N. mortenthaleri possess shortened, blockier outlines reminiscent of pencil stubs.

How did pencils originate?

Home / Science for Kids / 5Ws & H For Kids / How Did Pencils Originate? Not many people know that the pencil they use everyday can trace its history back 2000 years! Early writers, or scribes as they were called, of ancient Egypt, Rome and Greece wrote on forms of paper called papyrus.

Are pencils made from wood?

Later pencils were made from tropical rainforest trees. However, pencils are no longer made from wood as forests are getting depleted and trees are getting scarce. Most pencils today are woodfree or are made from plastic. The inside of a pencil or the ‘writing core’ is made with a mixture of graphite and clay.

How many species are there in the world?

Rough Estimates of Animal Species Numbers 1 Animals: 2 Invertebrates: 3 Sponges: 4 Cnidarians: 5 Mollusks: 6 Platyhelminths: 7 Nematodes: 8 Echinoderms: 9 Annelida: 10 Arthropods More items…

How many types of jellyfish are there?

The skin of jellyfish is so thin that they can breathe through it, and they do not have bones, brains, or hearts. There are more than 2,000, different types of jellyfish around the world. However, scientists believe that there could be as many as 300,000 different species that are yet to be discovered.

When were pencils made from graphite?

In 1802, the production of graphite leads from graphite and clay was patented by the Koh-I-Noor company in Vienna. In England, pencils continued to be made from whole sawn graphite.

Why are pencils made with sticks?

Graphite sticks were initially wrapped in string or sheepskin for stability. England would enjoy a monopoly on the production of pencils until a method of reconstituting the graphite powder was found in 1662 in Italy. However, the distinctively square English pencils continued to be made with sticks cut from natural graphite into the 1860s.

What is the origin of pencil?

Pencil, from Old French pincel, from Latin penicillus a “little tail” (see penis; pincellus is Latin from the post-classical period) originally referred to an artist’s fine brush of camel hair, also used for writing before modern lead or chalk pencils.

What is the Broken Pencil phenomenon?

The broken pencil phenomenon occurs during your everyday spearfishing outing. Fortunately for the fish, light refracts as it travels from the fish in the water to the eyes of the hunter.

What are pencil casings made of?

The most common pencil casing is thin wood, usually hexagonal in section but sometimes cylindrical or triangular, permanently bonded to the core. Casings may be of other materials, such as plastic or paper.

When were pencils invented?

In 1662, Germany started manufacturing pencils. These were highly polished pieces of wood and unpainted. As more and more manufacturers started making pencils, they needed some way to distinguish the makers of the pencils. By the end of the 19th century, the wood casings began to carry the manufacturer’s name.

How many mammals are there in the world?

Mammals make up one of the smallest groups, with just 5,513 members. Altogether the earth’s oceans, lakes, continents and islands support over 66,000 identified species of vertebrate animals and more than 307,000 species of plants. The species totals do not include domestic animals such as sheep, goats and camels.

How many different sizes of jellyfish are there?

Many people think of jellyfish as some of the smallest animals found in the ocean, but they really do come in all different sizes. Currently, around 2000 jellyfish types have been documented, but scientists estimate that there could still be over 300,000 species yet to be discovered.

What is the most popular species of jellyfish?

The most popular species being Moon jellyfish. The family also has rare species like Stygiomedusa gigantea. This rare creature has only been sighted 114 times in the last 110 years and is believed to be one of the largest invertebrate predators in the deep-sea ecosystem.

How many types of jellyfish are harmful to humans?

Of the 2,000-known species, only 70 can be harmful to human beings. The box jellyfish (Chironex flecker) are among the most dangerous. Turriptosis nutricula is a species of the jellyfish commonly referred to as the ‘immortal jellyfish’ since it can transform into the polyp state from the mature medusa thus avoiding death.

How to identify jellyfish?

This type of jellyfish can be easily identified as they have white bells at the bottom that are surrounded by a ring of purple or brown pigment. Its size ranges between 8-10 inches. They mainly feed zooplankton. Another common name given to the species is Cabbage Head Jellyfish. Lion’s mane jellyfish is the largest known species of jellyfish.

Why is graphite in pencils still called lead?

Because the pencil core is still referred to as “lead”, or “a lead”, many people have the misconception that the graphite in the pencil is lead, and the black core of pencils is still referred to as lead, even though it never contained the element lead.

Where was the pencil first discovered?

Supporting sentence: Graphite, the main material for producing a pencil, was discovered in 1564 in Borrowdale in England when lightning struck a local tree during a thunder.

Why are pencils made out of graphite?

Because graphite is soft, it requires some form of encasement. Graphite sticks were initially wrapped in string or sheepskin for stability. England would enjoy a monopoly on the production of pencils until a method of reconstituting the graphite powder was found in 1662 in Italy.

What are the characteristics of a pencil?

A pencil ( / ˈpɛnsəl / ( listen)) is a writing or drawing implement with a solid pigment core encased in a sleeve, barrel, or shaft that prevents breaking the core or marking a user’s hand. Pencils create marks by physical abrasion, leaving a trail of solid core material that adheres to a sheet of paper or other surface.

What causes a pencil to bend in water?

This change in speed causes the light to bend, or refract, meaning that the part of the pencil that is in the water will appear shifted. Many birds hunt by flying over the surface of water, then diving in once they see a fish.

What happens to the image of the pencil under water?

Additionally, the pencil as observed through the water, appears fatter than the pencil as observed above the water. Finally, as the pencil is moved farther and farther towards the edge of the glass, the image of the pencil under the water finally disappears from sight.