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One of the most important religious military orders, formed in the era of the Crusades.
This animation demonstrates how an escalator works.
The earliest version of the lute appeared in ancient Mesopotamia.
Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.
The American Civil War was fought between the Confederacy and the Union.
Concave and convex lenses are used for the correction of short-sightedness and long-sightedness.
Producing speech requires the synchronized operation of several cortical centers.
Heavy trucks play an important role in transportation.
This animation demonstrates the structure and operation of digital cameras.
Penguins are birds living in the Antarctic and adapted to cold temperature and swimming.
This animation demonstrates the anatomy of tulips, daffodils and snowdrops.
This animation demonstrates the structure and operation of different types of optical disk drives.
The naval battle fought by the British Navy against the German Navy was the largest sea battle in World War I.
Solomon's temple became one of the most important symbols of Jewish architecture.
Smoking severely damages the respiratory system, it may cause COPD or lung cancer.
Computer hard disk drives are devices of magnetic data storage.
A species of venomous snakes widespread in Europe. Its bite is rarely fatal to humans.
Gladiators were combatants who entertained audiences in fights against each other or wild animals in ancient Roman arenas.
The battleship USS Missouri, first deployed during WWII was also deployed in the Gulf War.
Electric current can be generated by rotating an armature loop in a magnetic field.
Dicotyledons have two embryonic leaves (cotyledons), while monototyledons have only one.