Battle of Muhi (11-12 April 1241)

The devastating defeat of the Hungarians in the battle against the Mongolians was the result of several bad decisions.

Napoleon´s soldier (19th century)

Napoleon Bonaparte´s Grande Armée was considered invincible.

Alpha-D-glucose (C₆H₁₂O₆)

Alpha-D-glucose is one of the stereoisomers of glucoses, specifically the D-glucoses.

Ammonia (NH₃)

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

Purine (C₅H₄N₄)

A heterocyclic aromatic organic compound, its derivatives include guanine and adenine.

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.

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 - 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 - Siege engines

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

Silver chloride (AgCl)

A white, crystalline compound that breaks down when affected by light.

Volume of spheres (demonstration)

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

Leonardo da Vinci’s inventions - Armoured car

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

Views

Pick the shape that is shown in different views below.

Net of a cube (exercises)

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

Navigation in space

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

Cuboid (exercises)

Edges, diagonals and faces of a cuboid can be identified by its vertices.

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

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

Silicon dioxide (SiO₂)

A polymorphic compound, mostly found in the form of quartz.

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