Fat-tailed scorpion

The fat-tailed scorpion is one of the world's most dangerous scorpions.

Waterfalls

Waterfalls form where a river flows over a steep precipice in its course.

Nitric acid (HNO₃)

One of the oxoacids of nitrogen. A colourless compound with a pungent odour, a strong...

Types of gears

Two meshing gears transmit torque during their rotational motion.

Non-orientable surfaces

The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one...

De Havilland DH-106 Comet 1 (1949)

The aircraft manufactured by the British de Haviland company was the world's first...

Battle of Marathon (490 BC)

The marathon running event was instituted in commemoration of the run of a Greek soldier...

The history of aviation

The animation offers a summary of the history of aviation from the Middle Ages.

Battle of Salamis (480 BC)

The Greek fleet owed their success to their good tactics and their fast and easily...

Auschwitz-Birkenau concentration camp

More than one million people died in the WWII Nazi death camp located in present-day Poland.

Platonic solids

This animation demonstrates the five regular three-dimensional (or Platonic) solids, the...

Cube (exercises)

Edges, diagonals and faces of a cube can be identified by its vertices.

Ratio of volumes of similar solids

This 3D scene explains the correlation between the ratio of similarity and the ratio of...

Conic sections

The conic section is a plane curve that is created when a right circular cone is...

Carbonic acid (H₂CO₃)

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

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical...

Shale gas

This animation explains the technology of shale gas extraction.

Generating alternating current

Electric current can be generated by rotating an armature loop in a magnetic field.

Medieval keep

Keeps were typical buildings in the Middle Ages, also built independently from castles.

Auschwitz I Labour camp

The concentration camp established on Polish territory was the administrative centre of a...

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