Surface tension

Surface tension is the property of a liquid that allows it to obtain the smallest surface area possible.

Hussite wagon fort

The Hussites mastered the use of war wagons in the 15th century.

Hunebeds

These special dolmens located in present-day Netherlands were built about 5,000 years ago.

Edible nightshades

Many of the most important food crops we consume belong to the family of nightshades.

Topography of the Earth

The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.

Papermaking

Paper was invented more than two thousand years ago.

Slavs

Modern Slavs live in 14 European countries that can be classified into 3 groups.

Cellulose (C₆H₁₀O₅)n

The building material of the cell walls and fibres of plants.

Monsters of the Palaeozoic: sea scorpions

Eurypterids are an extinct group of Palaeozoic aquatic arthropods.

Oil tanker

Oil tankers appeared in the late 19th century; today they are among the largest ships.

Reed and bulrush

Cosmopolitan monocots inhabiting watersides.

Kepler space telescope

The Kepler space telescope was launched by NASA to discover Earth-like planets orbiting other stars

Ziggurat (Ur, 3rd millennium BC)

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

Karst region (intermediate)

Karst formations include dolines and dripstones.

Viking longship (10th century)

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

Junk

A sailing vessel with characteristic lugsails used for both military and trade purposes.

Farming techniques

Farming techniques evolved with the development of human civilisation in the Middle Ages and the Modern Age.

Tardigrade

Tardigrades can survive in extreme environments, they can even stay alive in outer space.

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