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

Formation of hydrogen molecules

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

V-2 ballistic missile (1944)

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

Supermarine Spitfire (United Kingdom, 1938)

Spitfire was a legendary British single-seat military aircraft used in World War II.

Tanning, skin cancer

The topmost layer of our skin is the epidermis, which contains melanocytes.

RT-2PM Topol Intercontinental ballistic missile (Soviet Union, 1985)

A mobile, nuclear-capable ballistic missile developed at the end of the Cold War.

Guillotine

The device designed to carry out executions more humanely than before was named after a French doctor.

Jamestown (17th century)

Jamestown, founded in 1607, was the first permanent English settlement on the east coast of North America.

Working-class district (19th century)

Typical working-class districts with unhealthy living conditions were built at the time of the Industrial Revolution.

Medieval dungeon

A wide variety of torture devices were in use in medieval dungeons.

Archaeological excavation (pit house)

Large construction sites provide archaeologists searching for artefacts with a great deal of work.

Nitrogen cycle

Atmospherical nitrogen is bound by bacteria and used by living organisms in the form of various compounds.

Viking longship (10th century)

These excellent shipbuilders and sailors travelled great distances on the seas and rivers.

Karst region (intermediate)

Karst formations include dolines and dripstones.

Climate zones

The Earth is divided into geographical and climatic zones, which result in the zonation of vegetation.

Cannon operation (18th century)

The cannon was an important type of firearms at the beginning of modern history, widespread both on land and water.

Limbic system

The limbic system plays an important role in forming emotions and in learning.

Ziggurat (Ur, 3rd millennium BC)

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

Seafloor map

The boundaries of tectonic plates can be seen on the seafloor.

Hubble Space Telescope

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

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