Net of a cube (exercises)

Not all nets consisting of 6 congruent squares are foldable into...

Volume of spheres (demonstration)

The sum of the volume of the ´tetrahedrons´ gives an approximation...

Methanol (methyl alcohol) (CH₃OH)

The simplest saturated alcohol. A highly toxic compound, easily...

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

The polymath thought that if a screw-like structure can rotate...

Hungarian hussar

The term ´hussar´ refers to a type of light cavalry which...

Hungarian army in the 15th century (infantry)

One of the main units of Matthias Corvinus´ Black Army was the...

Acetone (C₃H₆O)

The simplest representative of ketones.

Soviet soldier (World War II)

The Soviet army became a very powerful power broker after WWI, at...

Purine (C₅H₄N₄)

A heterocyclic aromatic organic compound, its derivatives include...

Early Christian Necropolis, Cella trichora (Pécs, Hungary)

The Early Christian Necropolis in Pécs, Hungary is an outstanding...

Leonardo da Vinci’s inventions - Siege engines

Leonardo was not only a master artist, but also an accomplished...

Leonardo da Vinci’s inventions - Swing bridge (1487-1489)

Leonardo's creative legacy also includes several projects related...

Benzoic acid (C₆H₅COOH)

The simplest of the aromatic carboxylic acids.

Maltose (malt sugar) (C₁₂H₂₂O₁₁)

A disaccharide formed by the joining of two alpha-D-glucose molecules.

Benzene (C₆H₆)

Benzene is the simplest aromatic hydrocarbon.

Hydronium ion (H₃O⁺)

The presence of hydronium ions relative to hydroxide ions...

Sulphate ion (SO₄²⁻)

A compound ion produced when sulphuric acid releases a proton.

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