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Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.
The screw pump commonly attributed to Archimedes made irrigation much more effective
This animation demonstrates the states and largest cities of the USA.
By varying the position of the light source, you can examine the shades projected onto the planes of the coordinate system.
Scipio’s Roman army defeated Hannibal’s Punic army in the battle fought during the 2nd Punic war in Africa.
King Darius as well as Xerxes built pontoon bridges across the Bosphorus for the Persian army.
The Soviet-made satellite was the first spacecraft to be launched into outer space (in October 1957).
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.
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.
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.
A colourless, heavier-than-air gas, an intermediate in the production of nitric acid.
The simplest diol.
Synthetic rubber is produced by the polymerisation of isoprene.
Leonardo based the design of the flapping wing on birds' wings and a faulty hypothesis.
The polymath thought that if a screw-like structure can rotate fast enough, it will 'drill' into the air and fly.