When did the first mailbox appear? Detailed answer

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

When did the first mailbox appear? Detailed answer

Big encyclopedia for children and adults

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

Did you know?

When did the first mailbox appear?

The first mailbox in Europe, that is, one in which a letter could be dropped, knowing that it would be delivered to the addressee, appeared in Prussia in 1824. Prior to this, the sender himself had to take it to the postal department.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Why do many Pixar and Disney cartoons have the combination A113?

Many students at the California Institute of the Arts studied graphic design and character animation in room A113. This combination is referenced in all Pixar cartoons and many Disney animated films. For example, she is a license plate in the cartoons "Cars", "Toy Story" and "Lilo and Stitch", a model of a diver's camera from "Finding Nemo", a room number in "Monsters University". The spacecraft autopilot from WALL-E receives the code A113, which means the directive is never to return to Earth.

Test your knowledge! Did you know...

▪ What causes hiccups?

▪ How reliable are weather forecasts?

▪ Why does northeast India experience a rat infestation once every 48 years?

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:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

The physical standard of the kilogram will be replaced by the quantum formula 14.11.2018

The world is no longer using the kilogram standard, which has been kept at the International Bureau of Weights and Measures in Sevres, France since 1889. This is a small cylinder made of an alloy of platinum and iridium. The reason is that its mass can change.

"This is not very good, given the accuracy in measurements we need at the moment," said Thomas Grenon, head of France's National Laboratory for Metrology and Testing.

The kilogram remained the last measure that depended on the physical object. On November 16 in Versailles at the 26th General Conference of the International Bureau of Weights and Measures, everything will change. For a kilogram, the formula will be adopted. This will be a universal formula for determining the kilogram based on the laws of quantum physics.

Now a kilogram will be determined not by the weight of the standard, but by the amount of electrical energy needed to move an object weighing a kilogram. And the energy, in turn, is calculated on the basis of Planck's constant.

The General Conference of the International Bureau of Weights and Measures at the Paris Palace of Versailles will also discuss the definition of other major international units of measurement - the ampere (A) unit of electric current, the kelvin (K) unit of thermodynamic temperature, and the mole - a unit of measurement of the amount of substance.

The concept of gram and kilogram was introduced into science in 1795. Water was taken as the basis: it was believed that one kilogram is equal to the weight of a liter of water. For the mass standard, a platinum cylinder was first made, and then a platinum-iridium cylinder.

The standard was kept under reliable protection. Under two glass caps, from which the air was pumped out. Moreover, only three people in the whole world had access to the room where the standard stood. Everyone had their own key. But it was possible to open the door and enter the room with the standard only by turning three keys at the same time. But that didn't help either. By the end of the XNUMXth century, scientists discovered that the standard was gradually losing mass.

Other interesting news:

▪ Twenty inches organic

▪ Thousands of molecules combined into a single quantum state

▪ A fundamentally new type of photosynthesis has been discovered

▪ life under the hood

▪ center of shame

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ website section LEDs. Article selection

▪ article by Thomas Dewar. Famous aphorisms

▪ article Why do some people have curly hair? Detailed answer

▪ article Acceptor of goods. Job description

▪ article Amplifier-corrector for EPU ARKTUR-006-STEREO. Encyclopedia of radio electronics and electrical engineering

▪ article Favorite number. Focus Secret

Leave your comment on this article:

All languages of this page

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