Ancient Indians built huge, naturally ventilated storehouses.
This animation demonstrates the states and largest cities of the USA.
The screw pump commonly attributed to Archimedes made irrigation much more effective
Inhabitants of ancient Egypt wore characteristic clothes and jewellery.
Scipio’s Roman army defeated Hannibal’s Punic army in the battle fought during the 2nd Punic war in Africa.
The Soviet-made satellite was the first spacecraft to be launched into outer space (in October 1957).
By varying the position of the light source, you can examine the shades projected onto the planes of the coordinate system.
Tall buildings are mementoes of human history and technological development.
The structure of fortresses developed together with military technology.
According to the Bible Noah was ordered by God to build a large vessel to save his family and the animals from the flood
Influenced by Western Europe, the Tsar attempted to modernise the Russian Empire.
Fructose is the sweetest of the simple carbohydrates.
An odourless, yellow, solid substance, the 16th most common in the Earth´s crust. One of the best known sulphur compounds is pyrite, also known as ´fool´s...
An unsaturated monocarboxylic acid. The molecule contains double bond in cis orientation.
Ammonia is a colourless gas with a characteristic pungent smell. Its solution in water is called ammonium hydroxide or household ammonia.
A colourless, heavier-than-air gas, an intermediate in the production of nitric acid.
Water is a very stable compound of hydrogen and oxygen, vital for all known forms of life. In nature it occurs in liquid, solid and gaseous state.
The simplest diol.
The design for the armoured car features the most important military requirements: reliability, portability and great firepower.
Synthetic rubber is produced by the polymerisation of isoprene.