The two main parts of the central nervous system, the brain and the spinal cord are protected by the skull and the spinal column.
The warship having several rows of oars was the typical warship of the Hellenistic era.
This effective strategy was based on the fast and synchronised attack of different branches of the army.
The legendary M61 class locomotives of the Hungarian State Railways were manufactured by Nohab.
This animation demonstrates the mechanism and operation of record players.
An air conditioner cools the air inside by drawing heat away and releasing it outside.
Nuclear propulsion was first used by the US Navy for powering submarines in the mid-20th century.
The legendary ruler and military leader, Alexander the Great, established a vast empire.
The arms are moved by flexor and extensor muscles.
Bones of the lower limbs are connected to the trunk by the pelvis.
The Pula Arena, located in present-day Croatia, was one of the largest Roman amphitheatres in the Antiquity.
Formic acid is the simplest carboxylic acid.
Surface tension is the property of a liquid that allows it to obtain the smallest surface area possible.
The Hussites mastered the use of war wagons in the 15th century.
These special dolmens located in present-day Netherlands were built about 5,000 years ago.
The building material of the cell walls and fibres of plants.
Many of the most important food crops we consume belong to the family of nightshades.
A white, water-soluble, sweet compound known as sugar.
The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.
The apple is one of the most popular fruits around the world.