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The Boys of Paul Street, the Grund

One of the main settings in the well-known Hungarian youth novel was a timberyard.

Sulphuric acid (H₂SO₄)

A colourless, viscous liquid, a highly corrosive, strong acid used in several industrial processes.

Permanganate ion (MnO₄⁻)

Potassium permanganate is used as a disinfectant.

Kuruc soldier

The term ´kuruc´ denoted armed anti-Habsburg rebels (coming from various social classes) in Hungary in the 17th and 18th centuries.

Silver iodide (AgI)

A light yellow compound formed in the reaction of silver nitrate and potassium iodide.

Sodium chloride (NaCl)

Common salt (or table salt) is one of the most important sodium compounds, indispensable for living organisms.

Silver bromide (AgBr)

A white, crystalline compound which breaks down when exposed to light.

Football stadium

Football is one of the most popular team sports due to its relatively low equipment requirements and simple set of rules.

1-butanol (C₄H₁₀O)

A 4-carbon alcohol commonly used as a solvent.

Karst region (basic)

Karst formations include dolines and dripstones.

Construction of a panel building

Buildings constructed of prefabricated concrete blocks were widespread in the former Socialist countries.

Navigation in space

The animation helps to develop space perception and navigation in space using space coordinates.

Leonardo da Vinci’s inventions -– Siege engines

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

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

Leonardo's creative legacy also includes several projects related to bridges. This unusual swing bridge allowed for undisturbed water traffic.

Leonardo da Vinci’s inventions - Mechanical wing (1493–1495)

The mechanical wing is one of the masterpieces among Leonardo's sketches related to aviation.

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.

Ancient Roman senator with his wife

Senators, being members of the highest social class of ancient Rome, wore togas with purple edges.

Leonardo da Vinci’s inventions – Armoured car

The design for the armoured car features the most important military requirements: reliability, portability and great firepower.

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

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

Medieval Chinese soldier

The equipment of ancient Chinese soldiers was rudimentary.

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