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Darwin's legendary voyage aboard HMS Beagle played a crucial role in the development of the Theory of Evolution.
Bats use ultrasound to navigate and hunt for prey.
The German engineer Rudolf Diesel patented the diesel engine in 1893.
Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.
The animation shows the two-seater Lunar Rover used in the Apollo 15 mission
The layers of different types of forests may vary.
This animation demonstrates geometric rotation, a type of geometric transformation both in plane and space.
One of the directors of the circular, open-air Renaissance theater in London was William Shakespeare.
River locks make rivers with great level differences safe for boating.
A spectacular demonstration of algebraic expressions.
The ancient Inca city, located in present-day Peru, is a World Heritage Site.
Rivers play an important role in shaping the Earth's surface: they cause erosion as well as carrying and depositing sediment.
Studying Ceres and Vesta will help us learn more about the early history of the Solar System and how rocky planets are formed.
3-dimensional Cartesian coordinate system with illustrations and exercises that develop spatial perception.
Skeletal muscles form the active part of the locomotor system: they move the bones they are attached to.
Typical settlements of the Norsemen were not only established in Scandinavia, they appeared on distant areas as well.
Designated as the first National Treasure of South Korea, the Namdaemun was one of the major gateways of Seoul's Medieval city walls.
Candles have been used for lighting since ancient times.
The magnificent capital of the Aztec Empire astonished even the Spanish Conquistadors.
The Rutherford Experiment proved the existence of positively charged atomic nuclei. The results led to the elaboration of a new atomic model.