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.

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

DC motor

DC motors consist of a permanent magnet and a coil within the magnet, with electric current flowing in it.

Thyroid gland

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

Robots

An entertaining game about different views of spatial objects.

Ancient Roman siege engines

Ancient Roman conquerors had effective siege engines developed for attacking fortifications.

Ziggurat (Ur, 3rd millennium BC)

Ziggurats were typical terraced step pyramids used as temples in ancient Mesopotamia.

Soap

Fatty acid molecules consist of a polar head and a non-polar tail, therefore they are suitable for removing fat stains.

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.

Limbic system

The limbic system plays an important role in forming emotions and in learning.

Pearls

Pearls, often used as gemstones, are the by-products of certain molluscs' protective mechanisms.

Addition

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

Vertebrate brain evolution

During the evolution of vertebrates the relative development of brain areas has changed.

Ancient agriculture in the Nile Valley

Ancient Egypt was called the ‘gift of the Nile’, since the river played an important role in the rise of Egyptian civilisation.

AH-64 Apache (USA, 1975)

The Apache attack helicopter, named after an American Indian tribe, was developed for the United States Army.

Calcium carbonate (CaCO₃)

Limestone is a widely and diversely used material.

Chlorination of methane by a substitution reaction

During the substitution reaction the hydrogen atoms of methane are substituted with chlorine atoms, the by-product is hydrogen chloride.

Formation of hydrogen molecules

Hydrogen atoms within hydrogen molecules are held together by a covalent bond.

Viking longship (10th century)

These excellent shipbuilders and sailors travelled great distances on the seas and rivers.

Trench network (World War I)

Static warfare was one of the characteristics of WWI

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