Safety equipment of bicycles

The highway code contains rules concerning the safety equipment of bicycles.

Phases of the Moon

During its orbit around the Earth, the visibility of the Moon's illuminated part constantly changes.

Ancient Roman siege engines

Ancient Roman conquerors had effective siege engines developed for attacking fortifications.

Hero’s aeolipile

Hero of Alexandria is the inventor of the first steam engine, although he regarded it as an entertaining toy.

Palaeolithic cave

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

Jupiter

Jupiter is the largest planet of the Solar System, it has two and a half times the mass of all the other planets combined.

Mars

Possible traces of water and life are sought on Mars.

Tanks (World War II)

The main protagonists of World War II were tanks.

Auschwitz I Labour camp

The concentration camp established on Polish territory was the administrative centre of a huge camp complex.

Palace of Charlemagne (Aachen 9th century)

The palace of Charlemagne was not only the centre of his empire, but also a centre of culture.

Mercury

Mercury is innermost and smallest planet of the Solar System.

Neptune

Neptune is the outermost planet of the Solar System, the smallest of the giant planets

Saturn

Saturn is the second largest planet in the Solar System, easily recognisable by its rings.

Uranus

Uranus is the 7th planet from the Sun, a gas giant.

Battle of Thermopylae (480 BC)

The battle of the Greek-Persian War became famous for the heroic sacrifice of the Spartan soldiers.

Teatro Olimpico (Vicenza, 16th century)

The first indoor theatre in modern history to be constructed according to the theatre-building codes of Antiquity was inaugurated in 1585.

SM U-35 submarine (Germany, 1912)

Submarines had an important role in naval warfare as early as World War I.

Golden Gate Bridge (San Francisco, 1937)

The suspension bridge that stretches above the strait between San Francisco Bay and the Pacific Ocean was opened in 1937.

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

DC motor

DC motors consist of a permanent magnet and a coil within the magnet, with electric current flowing in it.

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