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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.
Hydrogen atoms within hydrogen molecules are held together by a covalent bond.
The German liquid-propellant rocket, developed during WWII, was the first known man-made object to reach space.
Spitfire was a legendary British single-seat military aircraft used in World War II.
The topmost layer of our skin is the epidermis, which contains melanocytes.
A mobile, nuclear-capable ballistic missile developed at the end of the Cold War.
The device designed to carry out executions more humanely than before was named after a French doctor.
Jamestown, founded in 1607, was the first permanent English settlement on the east coast of North America.
Typical working-class districts with unhealthy living conditions were built at the time of the Industrial Revolution.
A wide variety of torture devices were in use in medieval dungeons.
Large construction sites provide archaeologists searching for artefacts with a great deal of work.
Atmospherical nitrogen is bound by bacteria and used by living organisms in the form of various compounds.
These excellent shipbuilders and sailors travelled great distances on the seas and rivers.
Karst formations include dolines and dripstones.
The Earth is divided into geographical and climatic zones, which result in the zonation of vegetation.
The cannon was an important type of firearms at the beginning of modern history, widespread both on land and water.
The limbic system plays an important role in forming emotions and in learning.
Ziggurats were typical terraced step pyramids used as temples in ancient Mesopotamia.
The boundaries of tectonic plates can be seen on the seafloor.
The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.