Mechanical bell that functions by means of an electromagnet.
African villages adapt to the natural environment well and reflect of the culture of local tribes.
Yuri Gagarin became the first human in space on 12 April 1961.
The Suez Canal is an artificial waterway connecting the Red Sea and the Mediterranean Sea.
The skin is the soft outer covering of our body, its three layers are the epidermis, the dermis and the hypodermis.
The main parts of the human brain are the brain stem, the cerebellum, the diencephalon, and the cerebrum.
This animation explains the most important characteristics of waves through sound waves.
Deforestation has a negative impact on the environment.
Connective tissues include loose and dense connective tissues, adipose tissue, blood, tendon and bone tissue.
This animation presents some animals and plants that lived between the Devonian and Permian periods (358–299 million years ago).
Carrier of genetic information in cells.
What happens in a liquid during evaporation and boiling? What does its boiling point depend on?
The fortress-like palace was built by Roman Emperor Diocletian on the coast near his home town.
The longest part of the digestive system, where most of the digestion and absorption takes place.
The central nervous system consists of the brain and the spinal cord, the peripheral nervous system consists of nerves and ganglia.
Massive accelerating or orbiting bodies cause ripples in spacetime. These are called gravitational waves.
The first section of the gastrointestinal tract comprises the oral cavity, the pharynx and the oesophagus.
Waves play an extremely important role in many areas of our lives.
When producing sound, the vocal cords are vibrated by the air flowing out of the lung.
Several ingenious instruments have been invented over the centuries to help in navigating the seas.