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Carbon dioxide (CO₂) (intermediate)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Archimedes’ screw (3rd century BC)

The screw pump commonly attributed to Archimedes made irrigation much more effective

States and cities of the USA

This animation demonstrates the states and largest cities of the USA.

Light and shadow

By varying the position of the light source, you can examine the shades projected onto the planes of the coordinate system.

Battle of Zama (202 BC)

Scipio’s Roman army defeated Hannibal’s Punic army in the battle fought during the 2nd Punic war in Africa.

Persian pontoon bridge (5th century BC)

King Darius as well as Xerxes built pontoon bridges across the Bosphorus for the Persian army.

Sputnik 1 (1957)

The Soviet-made satellite was the first spacecraft to be launched into outer space (in October 1957).

Tall buildings

Tall buildings are mementoes of human history and technological development.

Medieval towers and bastions

The structure of fortresses developed together with military technology.

Noah’s ark

According to the Bible Noah was ordered by God to build a large vessel to save his family and the animals from the flood

Russian Tsar Peter I with his wife

Influenced by Western Europe, the Tsar attempted to modernise the Russian Empire.

Sulphur (S₈)

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...

Oleic acid (cis-octadec-9-enoic acid) (C₁₇H₃₃COOH)

An unsaturated monocarboxylic acid. The molecule contains double bond in cis orientation.

Ammonia (NH₃)

Ammonia is a colourless gas with a characteristic pungent smell. Its solution in water is called ammonium hydroxide or household ammonia.

Water (H₂O)

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.

Nitrogen monoxide (Nitric oxide) (NO)

A colourless, heavier-than-air gas, an intermediate in the production of nitric acid.

Isoprene (2-methyl-1,3-butadiene) (C₅H₈)

Synthetic rubber is produced by the polymerisation of isoprene.

Leonardo da Vinci’s inventions – Flapping wing (1487–1489)

Leonardo based the design of the flapping wing on birds' wings and a faulty hypothesis.

Leonardo da Vinci’s inventions – Aerial screw (around 1489)

The polymath thought that if a screw-like structure can rotate fast enough, it will 'drill' into the air and fly.

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