Tanks (World War II)

The main protagonists of World War II were tanks.

Nitrous acid (HNO₂)

One of the oxoacids of nitrogen. Colourless, moderate acid with a pungent odour, that exists only in aqueous solution.

Phosphorus pentoxide (P₂O₅)

A compound formed as white smoke during the combustion of phosphorus.

North River Steamboat (Clermont) (1807)

Robert Fulton American engineer created the first operational steam-powered ship.

Wind power station

Wind power stations convert the kinetic energy of the wind into electricity.

Conformations of ethane

The staggered conformation of ethane is more stable than the eclipsed conformation.

Lead-acid battery

Electrochemical processes in a lead-acid battery produce electric current.

Hubble Space Telescope

The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.

Hexagonal metallic lattice

Metals forming hexagonal metallic lattices are rigid and difficult to machine.

Woolly mammoth

Extinct proboscidea closely related to today's elephants, often hunted by prehistoric man.

Aurora cruiser ship (1900)

The name of the Russian armoured cruiser became well known during the October Revolution of 1917.

The first days in school

Learn the concept of colours, numbers, letters and shapes while playing

Planaria gonocephala

One of the most common types of flatworms.

Sulphurous acid (H₂SO₃)

Colourless, moderate acid, only known in aqueous solution.

Palaeolithic cave

The first dwellings in human history provide a lot of information about the lifestyle of our ancestors.

Medieval farmhouse

Farmhouses in the Middle Ages were simple, single-storey structures built from earth, mud and wood.

Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.

Diversity of light-detecting organs

Several analogous types of eyes have developed independently through convergent evolution.

Ancient Roman military camp

As the Roman Empire expanded, military camps were established on the newly conquered territories.

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