Hexagonal metallic lattice

Metals forming hexagonal metallic lattices are rigid and difficult to machine.

The countries of Africa

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

The countries of Asia

Learning about the geographic location, capitals and flags of Asian countries through exercises with three levels of difficulty.

Sulphurous acid (H₂SO₃)

Colourless, moderate acid, only known in aqueous solution.

The countries of Europe

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

Face-centred cubic metal lattice

The face-centred cubic metal lattice allows the closest fit of metal atoms.

Legendary ancient empires

Numerous legendary empires were built (and destroyed) in the course of history.

Continental drift on a geological timescale

The Earth's continents have been in constant motion during the history of the planet.

Battleship (HMS Dreadnought, 1906)

HMS Dreadnought revolutionised battleship-building in the 20th century.

Medieval farmhouse

Farmhouses in the Middle Ages were simple, single-storey structures built from earth, mud and wood.

Ziggurat (Ur, 3rd millennium BC)

Ziggurats were typical terraced step pyramids used as temples in ancient Mesopotamia.

Deep vein thrombosis and pulmonary embolism

A blood clot that forms in the deep veins of the lower limbs can cause a fatal pulmonary embolism if they enter the lungs.

The countries of the Americas

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

Legendary medieval empires

Numerous legendary empires were built (and destroyed) in the course of history.

Movements of the head

This animation demonstrates how muscles and vertebrae move the head.

Wind power station

Wind power stations convert the kinetic energy of the wind into electricity.

How does it work? – Escalator

This animation demonstrates how an escalator works.

The Mongol Empire

The legendary Mongol ruler Genghis Khan established a huge empire through his conquests.

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