Polymerised ethylene is known as polyethylene, a type of plastic.
The cathedral named after the Assumption of Mary into Heaven is one of the gems of French Gothic architecture.
Schooners, first built in the Netherlands in the 17th century, were mainly used as merchant ships.
Solar power stations convert solar energy into electricity.
Tidal power stations utilise the daily fluctuation of the water level for producing electricity.
Electric current can be generated by rotating an armature loop in a magnetic field.
This animation demonstrates the five regular three-dimensional (or Platonic) solids, the best known of which is the cube.
Entertaining and spectacular animation to practise orientation in space.
Edges, diagonals and faces of a cube can be identified by its vertices.
The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one side.
The conic section is a plane curve that is created when a right circular cone is intersected by a plane.
The German engineer Otto Lilienthal was the first person to make successful flights with a glider designed by himself.
A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.
This animation explains the technology of shale gas extraction.
Scoliosis is a medical condition in which a person's spine has a lateral deviation.
The Earth is divided into 24 time zones. Standard time is the time used within time zones.
The two main parts of the central nervous system, the brain and the spinal cord are protected by the skull and the spinal column.
Articulated lorries play an important role in road transport.
Several analogous types of eyes have developed independently through convergent evolution.
The American Civil War was fought between the Confederacy and the Union.