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 staggered conformation of ethane is more stable than the eclipsed conformation.
Keeps were typical buildings in the Middle Ages, also built independently from castles.
The products of oil refining include diesel oil, petrol and lubricants.
The Voyager space probes were the first man-made objects to leave the Solar System. They gather data about outer space and carry information about humanity.
The battle of the Greek-Persian War became famous for the heroic sacrifice of the Spartan soldiers.
Producing speech requires the synchronised operation of several cortical centres.
This animation demonstrates the five regular three-dimensional (or Platonic) solids, the best known of which is the cube.
Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.
The ancient city located near the river Euphrates was an important Sumerian centre.