Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.
Treated sewage water can be used in agriculture and industry.
The ancient city located near the river Euphrates was an important Sumerian centre.
One of the most important religious military orders, formed in the era of the Crusades.
The torii is a traditional Japanese gate built at the entrance of shrines.
Mirror image isomers of asymmetrical shapes and solids are non-superimposable.
The outcome of one of the greatest battles in the history of the ancient East (fought by the Egyptians and Hittites) was indecisive.
The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.
The characteristic ancient Greek statue was found on the bottom of the Adriatic Sea.
Raw iron is produced from iron ore in iron smelters.
The world-famous limestone cave with its amazing cave paintings is one of the most important archaeological sites of Palaeolithic art.
A metropolis is a large city with a population of over 1 million people.
The European badger is an omnivorous, nocturnal animal. Badger colonies live in large burrow systems, called setts.
A differential allows the driven wheels of a car to rotate at different speeds when the car is turning.
The topmost layer of our skin is the epidermis, which contains melanocytes.
In a passive house a comfortable inner temperature can be ensured without the use of traditional heating and cooling systems.
A special, 3D version of the well-known Chinese logical game.
Solar power stations convert solar energy into electricity.
The purpose of the electricity supply network is to provide electricity for consumers.
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.