Non-childish toys: theremin, or the ghost of a Soviet inventor

Theremin is an electro-musical device, the main element of which is a generator that creates high-frequency oscillations with a fixed frequency of 90 Hz. There is also a second generator - controlled. The frequency of its vibrations changes when the musician puts his hand to the antenna and thus changes the capacity of the antenna circuit

How to choose the right spark plugs

A spark plug is a device for igniting a fuel-air mixture in an internal combustion engine using an electric discharge with a voltage of several tens of thousands of volts that occurs between the electrodes. What are the candles talking about? In addition to performing its immediate task, spark plugs can serve as a visual indicator of the state of the engine

Prostatitis: a modern male problem

Prostatitis is an inflammatory lesion of the prostate gland, which is one of the most common diseases among the male population of the world. Unfortunately, many people know it firsthand: according to statistics, on average, every third man, starting at 25 years old, suffers from some form of prostatitis

Prostatitis: an inevitable payment for age or an ordinary disease?

For the first time, the prostate as an independent organ was described in the anatomical studies of the ancient Greek physician Herophilus, who practiced around 350 BC. At that time, however, the doctors did not pay much attention to her, and Herophilus’s works were practically not preserved, so that subsequently the gland was re-discovered by the Venetian physician Nicola Massa.

Morgenstern: the creepy star of the Middle Ages

Morgenstern (German: Morgenstern, “morning star”) is a special type of strike weapon, the warhead of which (“beat”) was a metal ball with pointed spikes protruding from different angles. This form gave it a certain resemblance to a star, for which the Morgenstern got its nickname. It is believed that the term "Morgenstern" first appeared in Switzerland. First

12 snowmobiles produced in Russia: driving in the snow

"Patrol" (Saratov). A company that produces very nice and fast amphibian snowmobiles for all occasions. The picture shows a 4-door modification. Also a 4-door modification, but elongated. And, finally, the most unusual model of the company is the Patrol amphibian. "Nerpa" (Kemerovo)

Biochemical testing ground in the Aral Sea: Renaissance island

From Nicholas to the Renaissance The idea that a scientific center for the development of biological weapons was necessary in the USSR appeared in the early years of Soviet power, and the Red Army command was almost immediately puzzled by the choice of a place where a secret object could be located. To test strains of viruses, it was required to find a large island at least 5 kilometers offshore, and the authorities even assumed that the case would take place on Lake Baikal, but in the end they chose other “candidates”: Solovki in the White Sea, Gorodomlya island in Seliger, and finally, the is

8 most famous archaeological sites of Russia

1. Rurikovo settlement in Novgorod Rurikovo settlement. Ruins of the Church of the Annunciation More than a thousand years ago, on a low hill, not far from the center of modern Veliky Novgorod, there was a city - a rich administrative, trade and craft center of the whole of Primenmenye - Rurikovo settlement

Unwind: Ballet Technique

Fuete and Fueters The technical boom in women's classical dance happened at the end of the 19th century and the Italians, often touring in St. Petersburg, were to blame for it. For one such visiting star, Pierina Legnani, who performed at the Mariinsky Theater for several consecutive seasons, the main Russian ballet, Swan Lake, was staged in 1895

What is 4K HDR, why is it needed and where can I see it?

When we say “4K”, we usually mean a panel with a resolution of 3840x2160. If we multiply these numbers, we get a television panel containing more than 8 million pixels. This figure is four times (!) Higher than the pixel density in standard HD-screens. The term 4K came from the film industry, where resolution has now reached the standard of 4096x2160. Th

Who invented the zipper and when?

In 1894, he managed to convince investors to found Universal Fastener, a fastener company. The head of the company, Lewis Walker, was convinced of the success of Judson’s invention, but things weren’t brilliant: the design was complicated and unreliable, and over 10 years the largest order was the purchase by the American postal service of 20 bag fasteners. In

How Gutenberg's printing press works: video

It is believed that the pioneer of printing in Europe was Johannes Gutenberg, who assembled the first machine in the mid-1440s on the basis of the wine press. Of course, after that the technology has been improved many times, but today we can clearly see the operation of the very device thanks to the Museum of the History of Printing in Crandell

Philips Smart TV Remote Control

One of the main rules in the development of the remote control states: the remote control must be understood instinctively, at least its basic functions. Well, the remote control of the Philips Smart TV series televisions can be safely characterized by a number of epithets, the main of which will be: clear, convenient and

To Mars at the Reactor: Explosive Force

The design scheme of the NRE with the IRGIT reactor Cross section of a twisted rod fuel assembly The first-born of the era of nuclear planets. In the late 1950s, both the USA and the USSR began active development of nuclear rocket engines, which were supposed in the near future, as it was written in one of the American articles, “to open the only possible way for interplanetary flights in the solar system at present ".

Fitzroy Stormglass: A Forgotten 19th Century Meteorological Instrument

The story is briefly like that. Robert Fitzroy, an aristocrat, naval officer, graduate of the Royal Naval Academy in Portsmouth in October 1828 was appointed captain of the famous Beagle vessel - a research barge that took part in four hydrographic expeditions. Charles Darwin himself took part in the third expedition - research done during this voyage formed the basis of many scientific works of the great scientist

Armored car "Punisher" copied from the game?

The Punisher is designed specifically for Russian special services and resembles the Batmobile, although it seems to have borrowed its name from another famous superhero. Inside the car can accommodate up to 10 fighters - back to back - and fire through the loopholes. The car is armored in the sixth class (it even protects from the armor-piercing incendiary bullet of the SVD rifle fired from a distance of 5-10 meters)

10 great medieval travelers

Julian of Hungary, Columbus of the East - a Dominican monk who set off in search of Great Hungary, the ancestral home of the Hungarians. By 895, the Hungarians settled in Transylvania, but still remembered the distant lands of their ancestors, the steppe regions east of the Urals. In 1235, the Hungarian prince Bela outfitted four Dominican monks on a trip

Real Vikings Crossed the Atlantic on a Real Drakkar

On the way, the dragcar moored in Shetland, on the Faroe Islands and in Greenland. The ancient Scandinavians sailed this way; those who left their native land for trade or robbery or exploration, they called vikingr - “gone camping”. From here came the word “Vikings”, which we now call the entire ancient population of Scandinavia and Northern Europe - the ancestors of modern Swedes, Danes and Norwegians. The ta

Interrupted flight: Soviet plates

The world's first "flying saucer" Eleven years ago, in the summer of 1993, a strange machine ran along the concrete of the test range of the Saratov Aviation Plant and took off into the air. Witnesses described its shape in different ways, calling it either a “tablet”, then “lentil”, or “bug”, or even a “flying cap”, but later, when semi-amateur shots literally went around the whole world from Japan to the USA, this aircraft began to be referred to as a “Russian UFO”. In fact, a 1.5-met

The battle with the mammoth: how ancient people hunted

As it turns out, everything is somewhat more complicated than our usual ideas of primitive hunting. Perhaps there were no traps, and they did not drive the mammoth into the swamp, since it was extremely problematic to get it out of there. And you will learn more about how our ancestors developed hunting skills from Alexander Sokolov, editor-in-chief of the Antropogenez

Armada of Count Zeppelin: Airships

LZ-129 "Hindenburg", built in 1936, was twice the size of the famous "Count Zeppelin" Count von Zeppelin realized that a thin-walled rigid shell could not withstand bending loads, causing wrinkling and destroying the most durable material. He came up with a frame made of lightweight box trusses riveted from aluminum strips with holes stamped in them In the Hindenburg salon, passengers could enjoy the luxury of an elite restaurant From the beginning of the history of aircraft is lighter than air - balloons and airships - to its seemingly complete completion, just a little mor

Efficient wind generator invented

The main problem of all modern wind energy is its cost, which is not competitive with traditional energy sources - hydro, heat and nuclear power plants. This problem is solved by increasing the power of wind generators. The power limit of classical designs being developed in Europe, reminiscent of windmills, is about 10 MW

Disk Dial History

Almon Strowger First disk telephone Alexander Bell 1. The first active telephone with the ability to dial using a disk was introduced in 1897. It was designed by the Automatic Electric Company, founded in 1891 in Kansas City by the undertaker Almon Strowger (1839-1902). Convinced that the employee of the telephone exchange transfers incoming calls of customers to his competitor, Strowger invented and patented the prototype of a modern telephone exchange and a disk dialer

Inside the Mayan pyramid they found a hidden room

Kukulkan Temple rises above the center of Chichen Itza. Its height is more than 30 meters, it was built somewhere between the 9th and 12th centuries and still presents surprises to modern researchers. The second internal structure of the pyramid was opened in 1935, and only now, in 2016, the third was opened with the help of electric signals

The best photos of 2015 according to World Press Foto

Rohan Kelly First Place in the Nature Category: Storm Front on Bondi Beach Anuar Patjane Floriuk Second Place in the Nature Category: Whispering Whales Sergio Tapiro Third Place in the Nature Category: Colima Volcano, Mexico The selection of winners and prize-winners was held among 5775 photographers from 128 countries who sent 82, 951 photos

How to play on changes in exchange rates?

If in a casino you can bet, for example, on red or black, odd or even, then in IQ Option you can bet on whether the exchange rate will increase or decrease at the auction at a certain point in time. Bets in this game are conditional or real money. That is, having acquired a demo account, a person can always practice before trading for real money

Braille: Hand Reading

Having suffered a crushing defeat in the Crusades, the king returned to Paris with the confidence that God was teaching his humility. With this faith, he founded the world's first blind shelter, Quinze-Vingts (in Russian, “fifteen points”). The first guests of the shelter were 300 knights blinded during the campaigns. Su

Mackwaitle: Mesoamerican Indians Glass Weapons

Makuawitl (also makuavitl, makuahutl, makuahuitl) (ast. Mācuahuitl; translates approximately as a "manual stick") - melee melee weapons of the inhabitants of Mesoamerica, in particular the Aztecs, Mayans, Mishtecs, Tlaxcaltecs and Pururepech. Macuaitl is very difficult to classify according to the European weapons system.

Justinian's plague - the first of the global epidemics

This pandemic (global epidemic) broke out around 541 years old and spread rapidly throughout Asia, North Africa, the Middle East and Europe. At the peak of its development, according to historians, it claimed 10, 000 lives on the territory of Constantinople daily, although modern experts believe that this figure can be doubled

Hyperboloid of an engineer Shukhov: Constructivist constructions

Vladimir Grigorievich Shukhov (1853−1939) On the left is a pre-revolutionary photo card: the first of the Shukhov towers at the exhibition in Nizhny Novgorod in 1896. To the right, after the Nizhny Novgorod exhibition in 1896, the first Shukhov tower was transported to the village of Polybino, Lipetsk Region, where the famous philanthropist Yuri Nechaev-Maltsov lived.