Fat-tailed scorpion

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

Nitrous acid (HNO₂)

One of the oxoacids of nitrogen. Colourless, moderate acid with a pungent odour, that exists only in aqueous solution.

Face-centred cubic metal lattice

The face-centred cubic metal lattice allows the closest fit of metal atoms.

Sulphurous acid (H₂SO₃)

Colourless, moderate acid, only known in aqueous solution.

Hexagonal metallic lattice

Metals forming hexagonal metallic lattices are rigid and difficult to machine.

Phosphorus pentoxide (P₂O₅)

A compound formed as white smoke during the combustion of phosphorus.

Hubble Space Telescope

The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.

Solar power station

Solar power stations convert solar energy into electricity.

Panthéon (Paris, 18th century)

The most important Neoclassicist building in France, completed in 1791, became the final resting place of many of France´s greats.

Shale gas

This animation explains the technology of shale gas extraction.

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.

Conic sections

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

Medical conditions of the spine

Scoliosis is a medical condition in which a person's spine has a lateral deviation.

Generating alternating current

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

House without carbon-dioxide emission

The design and structure of modern houses play an important role in environmental protection.

The Channel Tunnel

The Channel Tunnel is a 50.5 km long railway tunnel between the United Kingdom and France, beneath the English Channel.

Oil refinery

The products of oil refining include diesel oil, petrol and lubricants.

Non-orientable surfaces

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

Cube (exercises)

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

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