Thyroid gland

An important endocrine gland producing hormones that affect metabolism and the calcium balance of the body.

Sphere

A sphere is the set of points which are all within the same distance from a given point in space.

Cube

This animation demonstrates the components (vertices, edges, diagonals and faces) of the cube, one of the Platonic solids.

Cube of cubes

An exercise about the regular hexahedron built from unit cubes to help deepen your knowledge of cubes.

Farming techniques

Farming techniques evolved with the development of human civilisation in the Middle Ages and the Modern Age.

Robots

An entertaining game about different views of spatial objects.

Cuboid

A cuboid is a polyhedron with six rectangular faces.

Olympia (5th century BC)

The Olympic Games, held in the town every 4th year after 776 BC made it one of the centres of ancient Greece.

Archimedes’s military inventions (3rd century BC)

Archimedes was one of the most brilliant Greek scholars of ancient times, who made his mark with military inventions as well.

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.

Mycenae (2nd millenium BC)

The city with advanced culture was the first settlement in history to have a citadel.

Addition

Addition is a reaction in which the molecules of two or more substances unite without the formation of a by-product.

Producing ammonia from nitrogen gas and hydrogen gas

Large-scale ammonia production requires high temperature and pressure and the presence of iron as a catalyst.

Reaction of ammonia with hydrogen chloride

Ammonium chloride is the result of the reaction of ammonia and hydrogen chloride

Reaction of zinc with hydrochloric acid

The dissolution of zinc in hydrochloric acid produces hydrogen gas.

Dissolution of hydrogen chloride (HCl) in water

The solution of hydrogen chloride in water is called hydrochloric acid.

Reaction of hydrogen with oxygen

Knallgas is the mixture of hydrogen and oxygen. It will explode when ignited.

Dissolution of NaCl

Common salt is dissolved by water: polar water molecules form a coat around the ions.

Melting and freezing

During freezing hydrogen bonds are formed between water molecules resulting in a crystal structure.

Polymerisation of ethene

Polymerised ethylene is known as polyethylene, a type of plastic.

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