Covalent bonds in benzene molecules

In benzene there are sigma bonds and delocalised pi bonds between carbon atoms.

Countries of the World

Learning about the geographic location, capitals and flags of the world´s countries through exercises in three levels of difficulty.

Navigational instruments of the past

Several ingenious instruments have been invented over the centuries to help in navigating the seas.

The development of lakes

Standing bodies of water can form in depressions on the surface by both endogenic and exogenic forces, as well as by human activity.

Syrian water wheels (City of Hama, 13th century)

Medieval Syrian water wheels were used to convey water to distant areas.

Development of the atomic model

Major phases in the history of theories and views about the structure of the atom.

Chain reaction

Energy released during nuclear fission can be used for civilian or military purposes.

The Suez Canal

The Suez Canal is an artificial waterway connecting the Red Sea and the Mediterranean Sea.

The human blood

Human blood consists of blood cells and plasma.

Samurai

The primary duty of these Japanese warriors was to serve their feudal lords, even at the cost of their own lives.

Ancient Egyptian deities

Ancient Egyptians worshipped a large number of gods and goddesses.

Legendary buildings

A selection of legendary buildings from the history of civilisation.

Bacteria (advanced)

Bacteria are unicellular organisms that have no nuclei and are a few micrometres in length.

Watt´s steam engine (18th century)

The steam engine, perfected by the Scottish engineer James Watt, revolutionised technology.

Prenatal development

This animation demonstrates the development of the human embryo and foetus.

Tornadoes

Short-lived but extremely powerful tornadoes can cause a great deal of damage.

Physicists who changed the world

These great scientists had a tremendous impact on the advancement in physics.

Continents and oceans

Dry land on the surface of Earth is divided into continents which are separated by oceans.

Motorway design and construction

We can travel on dual carriageways on the motorway.

Interesting astronomy facts

This animation presents some interesting facts in the field of astronomy.

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