Comets are spectacular celestial bodies orbiting the Sun.
The ancient city of Babylon was built on the banks of the Euphrates River in Mesopotamia.
This animation demonstrates the structure and operation of CT scanners.
This animation explains transparency and opacity, the principle of radiography, and the light-absorbing properties of materials.
The Benz Patent-Motorwagen is widely regarded as the first vehicle propelled by an internal combustion engine.
A demonstration of nearby planets, stars and galaxies.
This animation demonstrates the most important relief features, surface waters and their relevant symbols.
The legendary city of the Mayan-Toltec Empire was located on the territory of present-day Mexico.
Combining a conventional internal combustion engine propulsion system with an electric propulsion system reduces emission.
This Pacific island is famous for its unique monolithic human figures.
The magnificent bath complex of the Roman Emperor was built in the 3rd century AD.
Careful tooth brushing is an important part of oral hygiene.
Oases are areas in deserts where water is available.
The bell is a percussion instrument and an idiophone. Many types of bells exist.
An introduction to the relief and hydrography of China.
The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.
A string quartet consists of four string players, it appeared in the late 18th century.
The river and marine sailing boats of ancient Egypt were one-masted, oared boats
The Byzantine Emperor was the head of the Byzantine Empire, the direct continuation of the Roman Empire.
The last Ice Age ended about 13 thousand years ago.