Imidazole (C₃H₄N₂)

A biologically and practically important organic compound.

Ammonium ion (NH₄⁺)

A compound ion generated when a proton is added to an ammonia...

Pluto - Charon system

The largest satellite of Pluto is Charon.

Typical Central European flat in the 1950s

Typical Central European flats in the 1950s consisted of a single...

Ichthyosaur

Fish-like marine dinosaurs which resembled dolphins; a good...

Chloromethane (methyl-chloride) (CH₃Cl)

Chloromethane can be prepared by heating a mixture of methane and...

Ethyl acetate (C₄H₈O₂)

One of the most important esters, produced by the reaction of...

Labour camp in Hungary (Recsk)

About 1,500 people were taken to the labour camp also known as...

Battle of Mohács (29 August 1526)

The devastating defeat in the battle against the Ottomans marked...

Medieval Chinese soldier

The equipment of ancient Chinese soldiers was rudimentary.

Hydrogen sulphide (H₂S)

A colourless, toxic gas with the characteristic odour of rotten...

Benzoic acid (C₆H₅COOH)

The simplest of the aromatic carboxylic acids.

Ancient Roman senator with his wife

Senators, being members of the highest social class of ancient...

Nitrogen-dioxide (NO₂)

A reddish-brown toxic gas, very reactive due to its unpaired electron.

Clothing (Western Europe, 10-12th century)

Clothing reflects the lifestyle and culture of the region's...

Medieval Royal Palace (Visegrád, Hungary, 15th century)

The magnificent palace was commissioned by Charles I of Hungary,...

Battle of Varna (1444)

Hungarian King Władysław I died in the lost battle fought against...

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