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The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.
A wide variety of optical instruments are in use today, ranging from microscopes to telescopes.
Ports must provide necessary infrastructure and services for industry and marine transport.
The capacity of data storage devices have increased at an incredible rate during the past decades.
The ruler of the vast Mongol Empire was the Khan.
The river and marine sailing boats of ancient Egypt were one-masted, oared boats
Three saturated fatty acid molecules linked to a glycerol molecule.
Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.
The most important weapons of medieval Arab warriors were the bow and the sword.
The masterpieces of ancient Greek potters are important archaeological artefacts.
The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.
Honeybees produce a sweet and nutritious substance, honey.
One of the positive influences of the Ottoman invasion of Europe was the construction of baths.
One of the most important monocot crops.
Viking leaders were elected from tribe members by the right of blood or an act of bravery.
Widespread heterotrophic unicellular organisms with constantly changing shapes
This animation demonstrates the anatomy of amphibians through the example of a common species of frogs.
A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.
The last Ice Age ended about 13 thousand years ago.
Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.