Do it yourself
Possessing a weapon that can only be found in computer games only in the laboratory of a mad scientist or near a temporary portal to the future is cool. To watch how people indifferent to technology involuntarily fix their gaze on the device, and avid gamers hastily pick up their jaw - it’s worth spending a day to assemble a Gauss gun.
When adjacent layers of particles (molecules) in a fluid move relative to each other, they collide, due to which the velocities in different layers equalize, and the energy of any external action is transferred in space. In such cases, one speaks of the forces of internal friction, or viscous friction
The story of lava lamps began in the 1960s when a simple accountant Edward Craven Walker filed a patent application for a lighting fixture with an exciting visual effect. Walker's original recipe included tinted water and a mixture of clear oil with translucent paraffin and tetrachloromethane. Pour in water
The focus of dry ice is that from a solid state it immediately passes into a gaseous state without an intermediate liquid phase (this process is called sublimation). The sublimation temperature of carbon dioxide is -78.5 ° C. Dry ice is freely sold in two forms - briquettes and granules. For experiments, it is more convenient to use granules, since they are small in size, they are easier to dose.
Recall that the Foucault pendulum is an experimental device with which you can visually observe the daily rotation of the Earth. It is a fairly long (in the original design of Jean Foucault length was 67 m) steel wire, on which the load is suspended. Over time, the plane of oscillation of the pendulum changes, slowly turning in the direction opposite to the direction of rotation of the Earth, and the geographical position (latitude) of the device affects the rate of change
The essence of Tesla’s invention is simple. If you power the transformer with a current with a frequency equal to the resonance for its secondary winding, the output voltage increases by tens or even hundreds of times. In fact, it is limited by the electric strength of the surrounding air (or other medium) and the transformer itself, as well as by the loss of radiation of radio waves.
Vinted Vinted.com Here you can sell any clothes, shoes or accessories that you no longer wear. Similarly, you can save a decent amount by diversifying your wardrobe. In addition, people not only exchange things, but also make new friends - what else can you dream of. Chairish Chairish.com Suppose you bought a chair or sofa, which you disagreed in a few months
But recently, people paid a lot of money for this! In those days when virtual reality glasses did not leave the cinema screens, in life only wealthy enthusiasts could afford them. For the window into the virtual world, one had to lay out several thousand dollars - because the coveted device used miniature color displays with a resolution of at least 640 x 480 (and the corresponding pixel size) and amazing “gyroscopic” sensors. Fa
Friction Perhaps the oldest and most reliable way to make fire in the wild is to use a dry tree. Remember how Tom Hanks washed his hands in the movie Outcast to Blood? In fact, such sacrifices are not necessary at all. First, dig a small hole in the ground to allow air to flow. After that, take a dry flat piece of wood and drill a small recess in it - this can be done with a regular sharp pebble
The valveless PuVRD is an amazing design. It has no moving parts, compressor, turbine, valves. The simplest PuVRD can do without even an ignition system. This engine can work on just about anything: replace the propane tank with a gas canister and it will continue to pulsate and create traction. Unfortunately, PuVRD proved to be insolvent in aviation, but recently they have been seriously considered as a source of heat in the production of biofuels
The first step was taken in 1888, when the American inventor John Laud received a patent for an ink pen capable of writing “on rough surfaces - such as wood, rough wrapping paper and others”, without clinging to pen irregularities. The pen itself was absent - ink was supplied to the surface by a “marking sphere”, which was supported by a number of smaller balls. The de
In 1934, he successfully graduated from the Ritsumeikan University School of Economics in Kyoto and received Japanese citizenship. Things were going well, but after the end of World War II, there was a decline. Ando in 1948 was sentenced to prison for tax evasion, and his company went bankrupt. However, Ando did not despair and soon began again from scratch, having founded a company for the production of edible salt
Vinegar and lemon juice The simplest “folk” rust remover is a mixture of vinegar and lemon juice. We mix them in equal proportions and apply to the rusty surface with a sponge or cotton swab (while avoiding contact with mucous and wound surfaces). After a couple of hours - it is important to ensure that the mixture does not dry out and periodically moisten the tool again - the rust will dissolve and it can be washed off with a stream of water and the surface cleaned to dry. Ba
At first glance, the easiest way to get a little liquid oxygen for experiments is to open an oxygen cylinder cooled to the desired temperature. Having sweated a lot, the “King of Random” found out that this strategy is no good, because, despite the high cost, there is very little oxygen in the cylinders. Th
Pure sand is a mixture of small grains of various rocks (mainly quartz). When the sand gets wet, quartz crystals are attracted to each other due to the forces of the surface tension of water, and therefore rather stable structures can be built from wet sand. When the water evaporates, there are not enough forces fastening the system, and the sand castle collapses
The paper machine was born at the turn of the 18th – 19th centuries and became one of the great inventions of the era of the industrial revolution. This machine, and at the same time a roll (mill for grinding cellulose raw materials) made paper a mass product, significantly cheaper it, gave it standard quality, but ..
Sodium is a ductile metal of silver color, rather electrically conductive and thermally conductive. It is used in industry as a strong reducing agent, as well as for the production of batteries. The video demonstrates that sodium reacts very violently with water. A slice of sodium thrown into the water ignites due to abundant heat, and begins to melt
Recently, the media have increasingly reported problems with the operation of airliners, aircraft crashes and other extreme situations in the air. If you fly regularly and want to be prepared for emergency situations, follow these guidelines. What can be done before the flight? 1. Choose large planes
John Collins approaches the creation of his paper planes with the scrupulousness of a true engineer. “Every paper airplane is a little scientific experiment, ” he says. “You make an assumption about which design and which“ settings ”will be better, conduct an experiment - throw - and then you get the results and analyze them.” Among C
Freezelight - long exposure photography, the key feature of which is the creation of meaningful images and abstractions using various light sources. An important condition is the lack of computer processing of the image. Such a definition appears on the web. But the term freezelight did not come from abroad at all
The classic version of the history of the appearance of the QWERTY keyboard layout is widely known. It says that one of the inventors of the typewriter, Christopher Latham Scholes, faced a technical problem when designing his mechanisms. Professional typists at work developed such a printing speed that with a quick press of several letters in a row, the levers with letters did not have time to move away from the roller with the paper and jammed
They started releasing "snow balls" in France in the 19th century, from there they penetrated into England, and in the 1920s crossed the ocean and gained incredible popularity in the USA. By the mid-twentieth century, this souvenir became one of the classic gifts for Christmas and New Year and often appeared in commercials and films
Our loyal readers remember how in March 2008 we tested the potato cannon and, having come to it with complete enthusiasm, promised to build a more perfect model in the future. And three years later, we were again drawn to vegetable artillery. Last time, we were satisfied with the accuracy and range, and now we decided to improve the rate of fire
Residents of fairly northern countries have long had an illogical New Year's custom - to decorate some pretty coniferous tree with beautiful, in human opinion, toys, put gifts under it for children and enjoy the procedure itself and its atmosphere. They say that this tradition is also among the inhabitants of insufficiently northern countries, but they have some other plants in use there
Over the past centuries, several generations of writing tools have changed. Goose feathers were replaced by fountain pens, then ballpoint pens. However, the design of another tool - a pencil - turned out to be so brilliantly simple that it almost without changes came from the Middle Ages to the present day and, possibly, will stretch for more than one century
At the end of the video, the user of the Magnet Tricks channel makes it clear how this works. The top itself is two neodymium magnetic rings with a non-metallic plate between them and a copper wire on top for balance. The surface above which the spinning top hovers is a copper plate weighing 1 kg, under which there are four rings of ferrite magnets
The classic name for this trick is levitating man trick (we will call it LMT for short). They came up with it a long time ago - Indian yogis practiced “levitation” at least 1000 years ago and, thanks to their amazing abilities, collected quite decent alms. There are several varieties of LMT. For example, sometimes two people take part in a composition. Th
In 1829, the brothers Thomas and Frantisek Grebner founded the first sugar factory in the western part of the Austrian Empire in the village of Kostelni Vidří near the town of Dacice (South Bohemia). Sugar beets were grown on three hectares of land in the neighborhood, but the soil turned out to be unsuitable, and in 1833 the production was moved to Dacice, where sugar cane was brought from Italian Trieste (switched to beets much later, in 1844).
In 1920, the company moved to Minneapolis and changed its name to MAR-O-BAR, and in 1923 it released the incredibly popular Milky Way bars. Soon, the company changed its name to Mars and moved to Chicago. Meanwhile, Forrest, having graduated from the University of California at Berkeley and then Yale, returned to his father's house with an engineering degree and the character of a businessman to help his father manage the company