Inventions in the 18th century resulted in huge advances in the development of the textile industry.
This animation demonstrates how a refrigerator works.
A type of herbivorous dinosaur easily recognizable by its large frill and three horns which lived in the Cretaceous period.
A game to practice the use of analog and digital clocks.
An Ames room is a distorted room that is used to create an optical illusion.
Keeps were typical buildings in the Middle Ages, also built independently from castles.
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary link between the two.
The statue was donated by the French to the USA for the centenary of gaining independence.
The animation shows the way forces act on wheeled vehicles and vehicles with runners.
An ant colony consist of a queen, male ants and workers.
This animation demonstrates the main sources of air pollution: Agricultural, industrial and urban air pollution.
System that satisfies consumers’ demands of water supply, wastewater disposal, electricity, heat and gas supply and telecommunication.
Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.
An extinct group of Cephalopoda, with solid external skeletons. They are excellent index fossils.
The ruler of the vast Mongol Empire was the Khan.
Honeybees produce a sweet and nutritious substance, honey.
The Aztec Empire was a despotic, militaristic state.
One of the most important religious military orders, formed in the era of the Crusades.
The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.
The Byzantine Emperor was the head of the Byzantine Empire, the direct continuation of the Roman Empire.