Several ingenious instruments have been invented over the centuries to help in navigating the seas.
The ancient Roman arena became well-known for the chariot races held here.
Standing bodies of water can form in depressions on the surface by both endogenic and exogenic forces, as well as by human activity.
The 'wise man' originated in Africa and dispersed throughout most of the continents.
The Buddhist pagoda of the six Harmonies is located in China, by the River Qiantang.
This animation explains active and passive transport processes occurring through cell membranes
Physical properties, as well as the flora and fauna of the ocean change with depth.
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 Olympian gods in ancient Greek mythology were as diverse as humans.
Rivers play an important role in shaping the Earth's surface: they cause erosion as well as carrying and depositing sediment.
Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.
This animations demonstrates the exterior and interior construction of cars, as well as their operation.
A type of steam locomotives used by British Railways were manufactured in the 1950s.
The layers of different types of forests may vary.
Chameleons are reptiles with an ability to change their colors.
The animation shows the traditional Japanese wooden townhouse, the machiya.
The formation of the Sun and the planets started with the contraction of a dust cloud about 4.5 billion years ago.
An interesting logical exercise: you have many weights that look the same, you have to find the only one that is different.
Amino acids are the monomers of proteins.