Why are pieces of marble scattered around the Parthenon at night? Detailed answer

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Why are pieces of marble scattered around the Parthenon at night? Detailed answer

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Why are pieces of marble scattered around the Parthenon at night?

Tourists like to take with them pieces of ancient structures "as a keepsake". Concerned about the fate of the Parthenon, the authorities of Athens hired special workers who scatter specially brought pieces of marble around the temple at night.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What is jazz?

Jazz is the name of a certain type of popular music. Originally it was American Negro music, but it has evolved into a mix of several different kinds of music from many parts of the world. One of the main characteristics of jazz is its rhythm. The jazz melody combines elements of African and European music, but its harmony comes mainly from Europe. Another characteristic feature of jazz is improvisation. This means creating something impromptu, under the influence of a momentary mood. Most jazz is played this way. Music is created as the performer plays. Jazz has changed and evolved over the years, but it has retained its core qualities.

One of the genres of music that contributed to the development of jazz was the blues. Jazz music is a third of the blues. Blues are more than half of the popular works of rock and roll. Even some American country and western music is written in blues form. The main contribution to the development of jazz was made by musicians from New Orleans. New Orleans jazz, sometimes referred to as Dixieland, combines the deep emotionality of blues and Negro religious song, as well as elements of ragtime and European folk music. Later came big band jazz, or swing music.

In the forties and fifties came what was called modern jazz. This modern jazz was more complex harmonically and melodic than earlier styles of jazz. But its most outstanding feature was its new approach to rhythm. When creating a melody, the performers used new rhythms, and the drums played in a more complex style.

Another major step in the development of jazz was the "new direction" of the sixties. This is a free form of jazz. The whole group of performers could change the tempo and speed of the piece several times during the performance without planning it in advance. This does not mean that the music is becoming disorganized: it is simply that it has become freer in spirit and manner. So you can see that jazz is a style of music that is constantly changing but retains its basic qualities.

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Fuel from photosynthesis 29.12.2020

Professor of Energy in the Department of Chemistry and Chemical Biology Daniel Nocera and his colleagues at Harvard University have created two devices - an artificial leaf and a bionic leaf - that use solar energy to produce liquid fuel.

The artificial sheet is a silicon-based solar cell with various catalytic materials attached to both sides. When immersed in water, the device uses the energy of sunlight to split water into oxygen and hydrogen. The bionic leaf, thanks to the bacterium Ralstonia eutropha, absorbs carbon dioxide from the air and combines it with hydrogen, which produces artificial leaves. Liquid fuel is produced by artificial photosynthesis.

The scientist noted that in 2020, researchers replaced the bacterium with Xanthobacter autotrophicus. This allowed the development of a device that combines nitrogen from the air and hydrogen from an artificial leaf to make fertilizer.

He added that artificial photosynthesis is 10 times more efficient than natural. In 2021, the team plans to explore practical ways to expand the technology. In the short term, this will help develop a decentralized energy, food and production structure that is carbon neutral. For example, hydrogen is already being used to fuel some vehicles.

Thanks to the energy of the Sun, it will be possible to produce plastics, pharmaceuticals and other substances. Nocera noted that the technology will come in handy when people fly to Mars. Water from the astronauts' urine can be combined with the carbon dioxide they exhale to produce synthetic drugs, vitamins, food, and medicines.

The world is looking for ways to sustain life without fossil fuels, and artificial photosynthesis technology brings society one step closer to this goal, scientists are convinced.

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