The Möbius strip and the Klein bottle are special two-dimensional surfaces with only one side.
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary link between the two.
The last Ice Age ended about 13 thousand years ago.
Penguins are birds living in the Antarctic and adapted to cold temperature and swimming.
The water supply system provides clean and safe drinking water for the consumers.
Edges, diagonals and faces of a cube can be identified by its vertices.
This animation demonstrates the structure and operation of digital cameras.
The Rosetta Stone helped to solve the mystery of hieroglyphics.
Wind, as an external force, plays an important role in shaping coastal areas and steppes.
The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.
Marine mammals, the largest known animals to have ever existed.
The migration of large human populations began in Ancient times.
This animation demonstrates the five regular three-dimensional (or Platonic) solids, the best known of which is the cube.
A geyser is a spring characterised by intermittent discharge of water and steam.
Common ciliated eucaryotic unicellular organisms widespread in freshwaters.
The animation shows the anatomy of turtles.
A type of snake with a characteristic spot on its neck.
An ancient Greek myth about the tragedy of father and son who wanted to flee the island of Crete.
Oases are areas in deserts where water is available.
Cyclones are large areas of circulating air with clouds and precipitation being formed in its centre.