Two-stroke engine

A two-stroke engine is a type of internal combustion engine with a cycle of only two (power) strokes.

Battle of Thermopylae (480 BC)

The battle of the Greek-Persian War became famous for the heroic sacrifice of the Spartan soldiers.

Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

Ancient Greek pottery

The masterpieces of ancient Greek potters are important archaeological artefacts.

Abbey of Saint Gall (11th century)

The building complex was one of the most important Benedictine abbeys for centuries.

Viking chieftain (10th century)

Viking leaders were elected from tribe members by the right of blood or an act of bravery.

Battle of Issus (333 BC)

The battle ended with the overwhelming victory of the Macedonian army over the Persian army led by Darius III.

Quetzalcoatlus, a giant pterosaur

Quetzalcoatlus was one of the largest known flying animals of all time.

Roman gladiators (2nd century)

Gladiators were combatants who entertained audiences in fights against each other or wild animals in ancient Roman arenas.

How does it work? - Optical disc drives

This animation demonstrates the structure and operation of different types of optical disc drives.

The phosphorus cycle

The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.

Common European viper

A species of venomous snakes widespread in Europe. Its bite is rarely fatal to humans.

USS Missouri (US, 1944)

The battleship USS Missouri, first deployed during WWII was also deployed in the Gulf War.

Types of gears

Two meshing gears transmit torque during their rotational motion.

Maize

One of the most important monocot crops.

Monsoon wind system

In summer, monsoon winds bring heavy rainfall from the ocean to the continent.

Types of bridges

Types of bridges include beam-, arch-, suspension-, cantilever and truss bridges.

How does it work? - Digital camera

This animation demonstrates the structure and operation of digital cameras.

Cities of the world

This animation demonstrates the geographical locations of the Earth's major cities.

Soil pollution

This animation demonstrates the main sources of soil pollution.

Added to your cart.