A white, water-soluble, sweet compound known as sugar.
One of the most common types of flatworms.
The urinary system serves for the removal of harmful and useless materials from the body.
Formic acid is the simplest carboxylic acid.
Oxygen carrier protein in our red blood cells.
Neurons are cells specialised for transmitting electric signals.
The first calendars and time-measuring instruments were already used by ancient Eastern civilisations.
The aircraft manufactured by the British de Haviland company was the world's first mass-produced commercial jetliner.
The marathon running event was instituted in commemoration of the run of a Greek soldier after the Battle of Marathon, fought between the Athenian and the...
One of the greatest archaeological finds of the 20th century was the tomb of the Egyptian pharaoh.
The animation offers a summary of the history of aviation from the Middle Ages.
The Greek fleet owed their success to their good tactics and their fast and easily manoeuvrable ships.
More than one million people died in the WWII Nazi death camp located in present-day Poland.
Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.
Keeps were typical buildings in the Middle Ages, also built independently from castles.
English sailing ships were among the best ships in the 17th-19th centuries.
Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.
Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.
Trolleybuses and trams are environment-friendly means of public transport
A group of fish characterised by a cartilaginous skeleton, well-known species include the great white shark and the great hammerhead shark.