The respiratory system is responsible for the intake of oxygen and the release of carbon dioxide.
Viruses consist of protein and DNA or RNA, they reprogram infected cells to produce more viruses.
This animation demonstrates the parts of the head, the torso and the limbs.
Christopher Columbus' three-masted carrack, the Santa Maria was the flagship of his first, landmark voyage.
Chameleons are reptiles with an ability to change their colours.
Human blood consists of blood cells and plasma.
The steam engine, perfected by the Scottish engineer James Watt, revolutionised technology.
The Parisian prison became legendary after the Revolution of 1789.
The main parts of the human brain are the brain stem, the cerebellum, the diencephalon, and the cerebrum.
The intriguing history of this historic castle spans nearly a thousand years.
In mountainous areas the climate, soil properties, the flora and fauna change depending on elevation.
This exciting and colourful game is designed to develop spatial perception. You can check your solutions using isometric views.
Connective tissues include loose and dense connective tissues, adipose tissue, blood, tendon and bone tissue.
Cannons also appeared in naval warfare.
The longest part of the digestive system, where most of the digestion and absorption takes place.
Galileo Galilei's scientific achievements contributed greatly to the advancement of physics and astronomy.
Carrier of genetic information in cells.
When producing sound, the vocal cords are vibrated by the air flowing out of the lung.
Machines converting the energy of flowing or falling water into useful forms of power were already in use in the Middle Ages.
The central nervous system consists of the brain and the spinal cord, the peripheral nervous system consists of nerves and ganglia.