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Turkish bath (16th century)

One of the positive influences of the Ottoman invasion of Europe was the construction of baths.

Aztec ruler (15th century)

The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.

Observatory

Observatories are often built at high elevations to minimise the effects of atmospheric turbulence

Mongol Khan (13th century)

The ruler of the vast Mongol Empire was the Khan.

Ancient Egyptian sailing boat

The river and marine sailing boats of ancient Egypt were one-masted, oared boats

The evolution of data storage

The capacity of data storage devices have increased at an incredible rate during the past decades.

Homo erectus

The ‘upright man’ used tools and could set fire.

Arab warrior (6th century)

The most important weapons of medieval Arab warriors were the bow and the sword.

Traditional Eskimo lifestyle

Igloos were the typical dwellings built by Eskimos living in the Arctic zone.

Fjord

A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.

Glaciation

The last Ice Age ended about 13 thousand years ago.

Geyser

A geyser is a spring characterised by intermittent discharge of water and steam.

Maize

One of the most important monocot crops.

Viking chieftain (10th century)

Viking leaders were elected from tribe members by the right of blood or an act of bravery.

The phosphorus cycle

The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.

The history of human migration

The migration of large human populations began in Ancient times.

Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.

Water supply system

The water supply system provides clean and safe drinking water for the consumers.

Chlorophyll

Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.

Inca warrior (15th century)

The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.

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