V-2 ballistic missile (1944)

The German liquid-propellant rocket, developed during WWII, was the first known man-made object to reach space.

Auschwitz I Labor camp

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

Palace of Charlemagne (Aachen 9th century)

The palace of the Frankish Emperor, Charlemagne, was not only the center of the Empire, but also a center of culture

Uranus

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

Venus

Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).

Trench network (World War I)

Static warfare was one of the characteristics of WWI

Cellulose (C₆H₁₀O₅)n

The building material of the cell walls and fibers of plants.

Hero’s aeolipile

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

AH-64 Apache (USA, 1975)

The Apache attack helicopter, named after an American Indian tribe, was developed for the United States Army.

Tanks (World War II)

The main protagonists of World War II were tanks.

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.

Olympia (5th century B.C.)

The Olympic Games, held in the town every 4th year after 776 B.C. made it one of the centers of ancient Greece.

Calcium carbonate (CaCO₃)

Limestone is a widely and diversely used material.

Ziggurat (Ur, 3rd millennium B.C.)

Ziggurats were typical terraced step pyramids used as temples in ancient Mesopotamia.

Chlorination of methane by a substitution reaction

During the substitution reaction the hydrogen atoms of methane are substituted with chlorine atoms, the by-product is hydrogen chloride.

Soap

Fatty acid molecules consist of a polar head and a non-polar tail, therefore they are suitable for removing fat stains.

Nitric acid (HNO₃)

One of the oxoacids of nitrogen. A colorless compound with a pungent odor, a strong oxidant.

Formation of hydrogen molecules

Hydrogen atoms within hydrogen molecules are held together by a covalent bond.

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