Which artist liked to place reproductions of his other paintings on the walls of the depicted rooms? Detailed answer

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Which artist liked to place reproductions of his other paintings on the walls of the depicted rooms? Detailed answer

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Which artist liked to place reproductions of his other paintings on the walls of the depicted rooms?

In the upper left corner of Reshetnikov's painting "Again a deuce" hangs a reproduction of his other famous painting - "Arrived on vacation". In turn, a reproduction of "Again deuces" is in the upper left corner of the painting "Re-examination", for which the same boy posed. Its protagonist sits at the table in the summer in a rural house and crams, while the rest of the children play outside.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What stars are called new?

Each year, 25-30 (by some estimates, even more than 200) new stars flare up in the Galaxy, although only a few of them are observed. The novae are characterized by an extremely rapid increase in brightness by thousands and even millions of times (by an average of 12 magnitudes, that is, 60 thousand times) over several days and a subsequent slow return to the initial state over several months or years (first, the brightness of the star faster and then it slows down).

A nova is a binary star, one component of which is a white dwarf and the other is either a star like the Sun or a red giant. The period of revolution of the components of this binary star is only a few hours, and therefore, the distance between them is quite small and the interaction forces are quite large.

When the second component of such a binary star expands in the course of its evolution, passing a certain boundary (the so-called Roche limit), part of its matter flows into the white dwarf. At the same time, such temperature and pressure are created on the surface of the white dwarf that the nuclear reaction becomes explosive, which explains the sharp increase in the brightness of the star.

Expanded (bloated) hundreds of thousands of times, the star separates at the moment of maximum brightness a gaseous shell, equal in mass to 0,00001-0,0001 of the mass of the Sun. That, gradually expanding, dissipates in space. The expansion rate of nova shells is about 1000 kilometers per second.

A distinctive feature of many new stars is the recurrence of their outbursts. The intervals between outbursts in repeated novae range from several tens to several thousand years (they are longer for those repeated novae that increase brightness more strongly).

Outwardly, the new ones are similar to supernovae, although in general we are talking about completely different phenomena and the energy released during the explosion is less than a million times.

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Researchers at Drexel University have demonstrated how an electromagnetic field can be used to make tiny robots move faster in a liquid medium. Scientists plan to use these devices in the future to deliver drugs through blood vessels.

Nanobots are chains of tiny round particles. The magnetic field rotates the particles, like a screw, while the longer the chain, the greater the speed it can develop. The scientists tested various robots, starting with strings of three "beads". The longest device consisted of 13 particles and reached a speed of 17,85 micrometers per second.

In order for the robots to move, an external magnetic field was applied. The faster the rotation speed of the field, the faster the chains moved. At the same time, the high frequency led to the division of long devices into shorter ones. So, a robot of seven beads, upon reaching a certain speed, begins to deform and is divided into two chains of three and four particles. The direction of the magnetic forces can be changed so that the two robots move in opposite directions.

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