Which army has a dog sled unit? Detailed answer

BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

Which army has a dog sled unit? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Did you know?

Which army has a dog sled unit?

The only dog sled unit in the world belongs to the Danish army. The military patrol "Sirius" patrols the northern coast of Greenland, where sleds are the only effective mode of transport.

At the same time, there are 6 teams in the service, consisting of 2 people and 10-15 dogs, and the distance between the two extreme points of their route is several thousand kilometers.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

How was the telephone invented?

The history of the creation of the phone is very interesting (no wonder they managed to make a movie about it!). But first, let's make sure we understand how the phone works.

When you speak, the air causes your vocal cords to vibrate. These vibrations are transmitted to the air molecules, i.e. sound waves coming out of your mouth vibrate the air. When they reach the aluminum disk-membrane in your phone's microphone, they make it vibrate in exactly the same way as the molecules of the air itself. These vibrations send undulating currents down the telephone line, which cause the membrane in the handset at the other end of the line to vibrate exactly the same as in the microphone of the transmitter telephone. In turn, the membrane creates waves in the air, similar to those sent into the microphone. When these air waves reach the ear of the person on the other end of the telephone line, they act as if they were coming from your mouth!

Now let's move on to the story of how Alexander Graham Bell invented the telephone. On June 2, 1875, he conducted an experiment in Boston, trying to simultaneously transmit several telegraph messages on the same wire. In doing so, he used a set of steel bars. Bell worked with the receiver in one room, and his assistant Thomas Watson with the transmitter in another.

Watson pulled the steel bar in such a way as to cause it to vibrate, and this created a ringing sound. Suddenly, Bell burst into the room shouting, "Don't touch anything! What did you do then? Let me have a look!" He discovered that a steel rod, vibrating over a magnet, caused an alternating current to flow through the wire. This caused the rod in Bell's room to vibrate and created a similar ringing sound.

The next day, the first telephone was made, and the sounds of the voice could be transmitted through the first telephone line, which led from the top floor of the building two floors down. And on March 10 of the following year, the first phrase was spoken on a real, working telephone: "Mr. Watson, come here, I need you!"

Test your knowledge! Did you know...

▪ Who Invented Paper?

▪ How is the World Team Racing Championship held?

▪ How did Edison contribute to the invention of the electric chair?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Children's best friends are pets 06.02.2017

Psychologist Matt Cassells (Matt Cassells) and his colleagues from the University of Cambridge found that children tend to experience more positive emotions from communicating with pets than with brothers and sisters. The presence of pets has a positive effect on the development of children, in particular, on the formation of communication skills and emotional intelligence. The results of the study are published in the journal.

The researchers recruited 12-year-old children from 77 families that had at least two children and kept a variety of pets for the study. Children from these families reported a closer emotional connection with their pets than with their siblings. There are fewer conflicts in relationships with pets, and communication with them is more enjoyable, the researchers note.

“Even if the animals can’t quite understand or respond to you, communication with pets was no less intimate than with siblings. And the fact that animals can’t talk can be seen as an advantage, because this is the key to an unbiased relationship,” said the doctor Cassells.

A number of previous studies have shown that boys interact with pets more often and more. The authors of the new work saw rather the opposite picture - in their sample, girls were more likely to talk about trust, friendship and quarrels with pets, which undoubtedly indicates a closer relationship.

Scientists have also found signs of unconditional benefits of having pets in the family. The social experience and support children receive from interacting with their pets has a positive effect on their emotional resilience in adulthood, scientists say. The topic of the long-term effects of communicating with pets still occupies the attention of psychologists.

Other interesting news:

▪ Sea in the pipeline

▪ Ulefone External IR Camera

▪ Bioelectronic mini-laboratory

▪ Oscilloscope ScopeMeter 190

▪ Beetles are the most tenacious creatures

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ site section Preamplifiers. Article selection

▪ article His example to others is science. Popular expression

▪ article Which of the comets is the most famous? Detailed answer

▪ article Work on the thermostat. Standard instruction on labor protection

▪ article Universal simulator. Encyclopedia of radio electronics and electrical engineering

▪ article Heat recovery. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews