Systemic circulation carries oxygenated blood from the heart to the body, while pulmonary circulation carries oxygenated blood from the lungs to the heart.
An earthquake is one of the most devastating natural phenomena.
Humans have 4 types of teeth: incisors, canines, premolars and molars.
Chameleons are reptiles with an ability to change their colours.
Energy released during nuclear fission can be used for civilian or military purposes.
This animation introduces body parts on a male anatomical model.
Built in Neo-Byzantine style, this Orthodox cathedral is one of the symbols of the Bulgarian capital city.
The animation demonstrates the different flower types of angiosperms.
These Palaeolithic statuettes probably symbolise fertility and prosperity.
Physical properties, as well as the flora and fauna of the ocean change with depth.
While generators convert mechanical energy into electrical energy, electric motors convert electrical energy into mechanical energy.
The layers of different types of forests may vary.
The animation shows the traditional Japanese wooden townhouse, the machiya.
This animation demonstrates Sir Isaac Newton's three laws of motion that laid the foundation for classical mechanics.
Combining a conventional internal combustion engine propulsion system with an electric propulsion system reduces emission.
This creative animation contains several 3D objects for colouring.
A demonstration of nearby planets, stars and galaxies.
The 900 years old Benedictine abbey is situated in Melk, on the right bank of the Danube.
Marie Curie, the only person to win the Nobel Prize in two different sciences, is probably the most famous woman in the history of science.
The legendary city of the Mayan-Toltec Empire was located on the territory of present-day Mexico.