Satellite types

Satellites orbiting the Earth can be used for civilian or military purposes.

Archimedes’s military inventions (3rd century B.C.)

Archimedes was one of the most brilliant Greek scholars of ancient times, who made his mark with military inventions as well.

Apatosaurus

Long-necked herbivorous dinosaur with a robust body.

Phosphorus pentoxide (P₂O₅)

A compound formed as white smoke during the combustion of phosphorus.

The city of Ur (3rd millennium BC)

The ancient city located near the river Euphrates was an important Sumerian center.

Cube (exercises)

Edges, diagonals and faces of a cube can be identified by its vertices.

The Knights Templar (12th-13th century)

One of the most important religious military orders, formed in the era of the Crusades.

Non-orientable surfaces

The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one side.

Aztec warriors (15th century)

The fearsome looking Aztec warriors could not stop the Spanish conquistadors with their primitive weapons.

Battle of Kadesh (1285 B.C.)

The outcome of one of the greatest battles in the history of the ancient East (fought by the Egyptians and Hittites) was indecisive.

Interesting geography facts – Physical geography

This animation presents some interesting facts in physical geography.

Land reclamation in the Netherlands, 17th century

Inhabitants of the northern part of the Netherlands have successfully fought the sea since the Middle Ages.

Nitrous acid (HNO₂)

One of the oxoacids of nitrogen. Colorless, moderate acid with a pungent odor, that exists only in aqueous solution.

Tidal power station

Tidal power stations utilize the daily fluctuation of the water level for producing electricity.

Battle of Salamis (480 B.C.)

The Greek fleet owed their success to their good tactics and their fast and easily maneuverable ships.

Open-cast mine

As opposed to underground mines, in open-pit mines the layers covering coal are removed, coal is extracted on the surface.

Sewage treatment plant

Treated sewage water can be used in agriculture and industry.

Time zones

The Earth is divided into 24 time zones. Standard time is the time used within time zones.

Auschwitz-Birkenau concentration camp

More than one million people died in the WWII Nazi death camp located in present-day Poland.

Platonic solids

This animation demonstrates the five regular three-dimensional (or Platonic) solids, the best known of which is the cube.

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