The urinary system

The urinary system serves for the removal of harmful and useless materials from the body.

Haemoglobin

Oxygen carrier protein in our red blood cells.

Papermaking

Paper was invented more than two thousand years ago.

Monsters of the Palaeozoic: sea scorpions

Eurypterids are an extinct group of Palaeozoic aquatic arthropods.

Oil tanker

Oil tankers appeared in the late 19th century; today they are among the largest ships.

Reed and bulrush

Cosmopolitan monocots inhabiting watersides.

Slavs

Modern Slavs live in 14 European countries that can be classified into 3 groups.

Neurons, nervous tissue

Neurons are cells specialised for transmitting electric signals.

Gothic cathedral (Clermont-Ferrand, 15th century)

The cathedral named after the Assumption of Mary into Heaven is one of the gems of French Gothic architecture.

Limbic system

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

Teatro Olimpico (Vicenza, 16th century)

The first indoor theatre in modern history to be constructed according to the theatre-building codes of Antiquity was inaugurated in 1585.

Arctic tern

The Arctic tern is famous for its long migration route: it flies from the Arctic to the Antarctic and back again each year.

Polynesian family settlement (Samoa, 15th century)

The architecture of traditional Samoan family settlements reflect the unique culture of their inhabitants.

The Brandenburg Gate

This Neoclassical structure is one of the best-known landmarks of Berlin and Germany.

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.

Soap

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

Formation of hydrogen molecules

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

Guillotine

The device designed to carry out executions more humanely than before was named after a French doctor.

Jamestown (17th century)

Jamestown, founded in 1607, was the first permanent English settlement on the east coast of North America.

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