Gibbons are the smallest and most sensitive apes. Its biggest feature is that its arms and hands are very long. Even when standing upright, its fingers can touch the ground. Do you know why Gibbons have long arms? Next, let’s introduce the gibbon and its long arm.

Gibbons live in dense jungle. They live in families, including one male, one female and two to four cubs. Gibbons mainly live in tropical forests in Asia. Gibbon is distributed in a small amount in China and is a precious national first-class protected animal.

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The most common figure in the world may be round, such as falling raindrops, the cross-section of a tree trunk, the flower center of a flower, the sun and moon overhead, and various stars and planets observed under various high-end astronomical telescopes.

The PI we know today is usually expressed by the Greek letter π. It is the ratio of the circumference of a circle to its diameter, and also the ratio of its area to the square of its radius. It can be used to calculate the circumference, area, volume of a sphere and so on.

Mathematicians believe that Pi is actually an irrational number, in other words, an infinite non cyclic decimal. It has no numerical law and will be arranged in a relatively disorderly way all the time.

Source: @__.space.babe.art.__

Plato is the founder of Western objective idealism. His philosophical system is broad and profound, which has a great influence on his teaching thought. Plato believed that the world was composed of “idea world” and “phenomenon world”. The phenomenon that every human being is exposed to is a kind of temporal and spatial phenomenon, but the real world is only a kind of temporal and spatial phenomenon.

Plato believed that all human knowledge comes from talent, which exists in human soul in a potential way. Therefore, cognition is not the feeling of the material world, but the memory of the conceptual world.

The purpose of teaching is to restore people’s inherent knowledge. The teaching process is the process of the concept of “recall”. In teaching, Plato attached importance to the general and general understanding, especially the cultivation of students’ thinking ability, and believed that concepts and truth were the products of pure thinking.

Source: @alejandronubo

Aristotle (384-322 BC), ancient sage, ancient Greek, one of the great philosophers, scientists and educators in the ancient history of the world, can be called the epitome of Greek philosophy. He is a student of Plato and a teacher of Alexander.

In 335 BC, Aristotle opened a school called Luceion in Athens, known as the carefree school. Marx once called Aristotle the most erudite figure among ancient Greek philosophers, and Engels called him “ancient Hegel”.

As an encyclopedic scientist, he has made contributions to almost every discipline. His writing involves ethics, metaphysics, psychology, economics, theology, politics, rhetoric, natural science, pedagogy, poetry, customs, and Athenian law. Aristotle’s works constructed the first extensive system of western philosophy, including morality, aesthetics, logic and science, politics and metaphysics.

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The periodic table of chemical elements is a list of chemical elements sorted from small to large atomic weight. The list is generally rectangular, with spaces in some element cycles, so that elements with similar characteristics belong to the same family.

Because the periodic table can accurately predict the characteristics of various elements and the relationship between them, it is widely used in chemistry and other scientific fields as a very useful framework for analyzing chemical behavior.

Source: @adiebee_tattoo