In mountainous areas the climate, soil properties, the flora and fauna change depending on elevation.
The English engineer George Stephenson’s locomotive was built for a competition of locomotives in 1829.
The popular model of the American automobile factory was the first mass-produced car in the world.
Bones of the upper limbs form the pectoral girdle and the arms.
3-dimensional Cartesian coordinate system with illustrations and exercises that develop spatial perception.
Studying Ceres and Vesta will help us learn more about the early history of the Solar System and how rocky planets are formed.
This animation presents some interesting facts in the field of astronomy.
The intriguing history of this historic castle spans nearly a thousand years.
Eukaryotic cells with nuclei measuring only a few micrometres may contain nearly 2 metres of DNA, coiled multiple times.
As a result of the revolutionary advances in the Neolithic, settling human communities established the first lasting settlements.
Systemic circulation carries oxygenated blood from the heart to the body, while pulmonary circulation carries oxygenated blood from the lungs to the heart.
Majestic even in its ruins, this city was the largest and most populous settlement in the pre-Columbian Americas.
Rotating a geometric shape around a line within its geometric plane as an axis results in a solid of revolution.
This animation demonstrates geometric rotation, a type of geometric transformation both in plane and space.
A spectacular demonstration of algebraic expressions.
This animation demonstrates the structure and operation of hair dryers.
The two groups of angiosperms are monocots and dicots.
Deforestation has a negative impact on the environment.
This animation compares the life cycles of mosses and ferns, helping to understand the general life cycle of plants.
The curvature of the lens of the eye changes when we look at a distant or at a near object, to ensure a sharp image.