The invention of the ballpoint pen made writing a lot easier.
The first calendars and time-measuring instruments were already used by ancient Eastern civilisations.
Edges, diagonals and faces of a cube can be identified by its vertices.
HMS Dreadnought revolutionised battleship-building in the 20th century.
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.
Enzymes are protein molecules catalysing biochemical reactions. Their activity can be regulated.
The highway code contains rules concerning the safety equipment of bicycles.
Uranus is the 7th planet from the Sun, a gas giant.
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 aircraft manufactured by the British de Haviland company was the world's first mass-produced commercial jetliner.
The face-centred cubic metal lattice allows the closest fit of metal atoms.
Electric current can be generated by rotating an armature loop in a magnetic field.
Articulated lorries play an important role in road transport.
Schooners, first built in the Netherlands in the 17th century, were mainly used as merchant ships.
From the 1940s, the increasingly large aircraft carriers became the masters of the oceans.
The concentration camp established on Polish territory was the administrative centre of a huge camp complex.
A bireme is a type of ancient warship, with a characteristic pointed bow and two decks of oars, used by many armies.
The fat-tailed scorpion is one of the world's most dangerous scorpions.