Underground coal mining

As opposed to opencast mines, in underground mines the layers covering coal are not removed, coal is extracted from mine shafts.

Radial engine

Radial engines are used primarily in airplanes and helicopters.

Types of soil (soil profiles)

This animation demonstrates different types of soil.

Capacitors

Capacitors store electrical energy in the form of electric charge.

Saint Basil's Cathedral (Moscow, 16th century)

The church consecrated to Saint Basil was commissioned by Ivan the Terrible.

Movie theater (USA, 1930s)

Movie theaters were built in large numbers in big cities of the U.S. in the 1910s.

Metals

Metal atoms form a regular lattice structure.

The Madara rider

A rock relief located in Northeast Bulgaria, probably carved at the end of the 7th century.

The withdrawal reflex

The withdrawal reflex is a spinal reflex that ensures moving away from potentially damaging stimuli.

Color vision deficiency

The inability to differentiate certain shades of color is called color vision deficiency.

Oil platform

A long pipe in the center of the tower penetrates the ocean bed until it reaches the layer that contains oil.

Daedalus and Icarus

An ancient Greek myth about the tragedy of father and son who wanted to flee the island of Crete.

The Brandenburg Gate

This Neoclassical structure is one of the best-known landmarks of Berlin and Germany.

Polynesian family settlement (Samoa, 15th century)

The architecture of traditional Samoan family settlements reflect the unique culture of their inhabitants.

Dromedary

The dromedary is an indispensable animal for inhabitants of the deserts.

Abbey of Saint Gall (11th century)

The building complex was one of the most important Benedictine abbeys for centuries.

How does it work - Refrigerator

This animation demonstrates how a refrigerator works.

Louis XIV (the Sun King)

The French monarch got his epithet because of his opulent and extravagant lifestyle.

Triceratops

A type of herbivorous dinosaur easily recognizable by its large frill and three horns which lived in the Cretaceous period.

Adrenaline (advanced)

Adrenaline, also known as epinephrine, is a hormone produced in our bodies in stressful situations and plays an important role in the fight-or-flight response.

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