Nervous system

The central nervous system consists of the brain and the spinal cord, the peripheral nervous system consists of nerves and ganglia.

Voice production

When producing sound, the vocal cords are vibrated by the air flowing out of the lung.

Parts of the human brain

The main parts of the human brain are the brain stem, the cerebellum, the diencephalon, and the cerebrum, which is divided into lobes.

Development of the atomic model

Major phases in the history of theories and views about the structure of the atom.

Chain reaction

Energy released during nuclear fission can be used for civilian or military purposes.

Nose, the mechanism of smelling

Olfactory receptors produce electric signals when stimulated by odors.

Covalent bonds in benzene molecules

In benzene there are sigma bonds and delocalized pi bonds between carbon atoms.

Mechanism of taste reception

Taste receptors convert chemical stimuli into electric signals.

Anatomy of the small intestine

The longest part of the digestive system, where most of the digestion and absorption takes place.

Connective tissues

Connective tissues include loose and dense connective tissues, adipose tissue, blood, tendon and bone tissue.

The human brain

The main parts of the human brain are the brain stem, the cerebellum, the diencephalon, and the cerebrum.

BR Standard Class 3 2-6-2T steam locomotive

A type of steam locomotives used by British Railways were manufactured in the 1950s.

Dynamo (intermediate)

A dynamo converts mechanical energy into direct current.

The mechanism of vision

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.

Comparison of edible and poisonous mushrooms

Certain mushrooms are poisonous and can be fatal for humans when consumed, while others are edible and used widely in cooking.

Taj Mahal (Agra, 17th century)

The center of the Indian mausoleum complex is a white marble tomb built by Shah Jahan for his beloved wife.

The water cycle (intermediate)

Water on Earth is in a continuous state of change. The water cycle includes processes such as evaporation, precipitation, melting and freezing.


Machines converting the energy of flowing or falling water into useful forms of power were already in use in the Middle Ages.

Telephone (Alexander Graham Bell)

The device that transmits human voice as electrical signals was invented by Bell in 1876.

Geometric transformations – translation

This animation demonstrates geometric translation in both plane and space.

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