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An interesting logical exercise: you have many weights that look the same, you have to find the only one that is different.
The average house in Ancient Greece had a rectangular, geometrical floor plan and two storeys.
Medieval Syrian water wheels were used to convey water to distant areas.
Wealthy citizens in ancient Rome owned large houses with varied layouts of several rooms.
The first supersonic passenger airliner entered service in 1976.
Commercial maritime routes of container ships form a global network.
Christopher Columbus' three-masted carrack, the Santa Maria was the flagship of his first, landmark voyage.
The ancient city of Babylon was built on the banks of the Euphrates River in Mesopotamia.
This animation demonstrates the parts of the head, the torso and the limbs.
River locks make rivers with great level differences safe for boating.
Designated as the first National Treasure of South Korea, the Namdaemun was one of the major gateways of Seoul's Medieval city walls.
The respiratory system is responsible for the intake of oxygen and the release of carbon dioxide.
This animation demonstrates the internal structure of the brain.
A symbol of division and oppression, the Wall tore a city and numerous families apart.
The atomic bomb is one of the most destructive weapons in human history.
This bizarre-looking fish uses its bioluminescent lure to catch its prey. The animation explains how it works.
The Troll A is an offshore natural gas platform, the largest offshore platform ever built: it rises about 170 metres above water level, weighs 656,000...
A hydrothermal vent is a fissure in the planet's surface through which geothermally heated water erupts.
A wooden church built in the 12th-13th centuries, the best preserved of Norway´s stave churches.
Our gametes are haploid cells produced from diploid cells by meiosis, a special type of cell division.