Bireme (ancient oared warship)

A bireme is a type of ancient warship, with a characteristic pointed bow and two decks of oars, used by many armies.

Nitrous acid (HNO₂)

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

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.

Hexagonal metallic lattice

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

Sulphurous acid (H₂SO₃)

Colourless, moderate acid, only known in aqueous solution.

Face-centred cubic metal lattice

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

Metropolises

A metropolis is a large city with a population of over 1 million people.

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.

Space Shuttle

The Space Shuttle was a manned, reusable spacecraft operated by NASA.

Land reclamation in the Netherlands, 17th century

Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.

Conquistador (16th century)

Spanish conquerors owed their success to their armour and firearms.

Seeds and germination

Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.

Aztec warriors (15th century)

The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.

Battle of Kadesh (1285 BC)

The outcome of one of the greatest battles in the history of the ancient East (fought by the Egyptians and Hittites) was indecisive.

De Havilland DH-106 Comet 1 (1949)

The aircraft manufactured by the British de Haviland company was the world's first mass-produced commercial jetliner.

The Knights Templar (12th-13th century)

One of the most important religious military orders, formed in the era of the Crusades.

The city of Ur (3rd millennium BC)

The ancient city located near the river Euphrates was an important Sumerian centre.

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