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Four skeletons made through x-ray

Four skeletons made through X-ray

Outer space. constellations and galaxies

Outer space. Constellations and galaxies

The planets lined up in a row is an amazing phenomenon

Multicolored planes flying on a black background

Emerging technologies of the twenty-first century

Geometric shapes. intersecting rhombuses

Geometric shapes. Intersecting rhombuses

An unusual image of the famous brand by

The disk of the blood-red moon in the dark

Illustration "metal eye in the dark"

Illustration "Metal eye in the dark"

In a matter of seconds, night turns into day

Abstract of energy, movement of light

Fantasy dome under the starry sky

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Система знаний о закономерностях в развитии природы, общества и мышления, а также отдельная отрасль таких знаний. То, что поучает, даёт опыт, урок (в 4 знач.; разг. ).