The first days in school

Learn the concept of colours, numbers, letters and shapes while playing

The Doppler effect

It is a well-known phenomenon that the sound of an approaching sound source is higher...

Carbonic acid (H₂CO₃)

Colourless, odourless liquid produced by dissolving carbon dioxide in water.

Conformations of ethane

The staggered conformation of ethane is more stable than the eclipsed conformation.

V-1 flying bomb

The V-1 flying bomb was an early pulse-jet-powered cruise missile developed in Nazi...

Mitsubishi A6M Zero (Japan, 1940)

The Japanese Mitsubishi A6M, commonly known as 'Zero' to the Allies, was a legendary...

Transformer

A transformer is a device used for converting the voltage of electric current.

Biogas power plant

Biogas can be produced from organic material (manure, plant waste, organic waste) using...

Battleship (HMS Dreadnought, 1906)

HMS Dreadnought revolutionised battleship-building in the 20th century.

Junk

A sailing vessel with characteristic lugsails used for both military and trade purposes.

How does it work? – Cinema projector

This animation demonstrates the design and operation of a traditional cinema projector.

Inca warrior (15th century)

The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish...

Dodo

The dodo is an extinct species of birds that used to be native to the island of...

Стратегията светкавична война (1939-1940г.)

Тази ефективна стратегия е основана на бързата, синхронизирана атака от различни клонове...

Rosetta Stone

The Rosetta Stone helped to solve the mystery of hieroglyphics.

Aeolian landforms on coasts and steppes

Wind, as an external force, plays an important role in shaping coastal areas and steppes.

Едногърба камила

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

Medieval smithy

The work of smiths – one of the first professions in history – became even more important...

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