A bireme is a type of ancient warship, with a characteristic pointed bow and two decks of oars, used by many armies.
One of the oxoacids of nitrogen. Colourless, moderate acid with a pungent odour, that exists only in aqueous solution.
One of the largest marsupials.
A compound formed as white smoke during the combustion of phosphorus.
The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.
Metals forming hexagonal metallic lattices are rigid and difficult to machine.
Colourless, moderate acid, only known in aqueous solution.
The least tightly packed crystal structure.
The face-centred cubic metal lattice allows the closest fit of metal atoms.
A metropolis is a large city with a population of over 1 million people.
The most important Neoclassicist building in France, completed in 1791, became the final resting place of many of France´s greats.
The Space Shuttle was a manned, reusable spacecraft operated by NASA.
Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.
Spanish conquerors owed their success to their armour and firearms.
Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.
The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.
The outcome of one of the greatest battles in the history of the ancient East (fought by the Egyptians and Hittites) was indecisive.
The aircraft manufactured by the British de Haviland company was the world's first mass-produced commercial jetliner.
One of the most important religious military orders, formed in the era of the Crusades.
The ancient city located near the river Euphrates was an important Sumerian centre.