Water turbine, generator

Water turbines convert the kinetic energy of water into electric current.

Hot air balloon

A hot air balloon is a balloon aircraft which is lifted by hot air.

The upper gastrointestinal tract

During swallowing food travels from the mouth cavity into the stomach.


A type of prehistoric reptile having bony plates on its back, which aided thermoregulation.

Types of soil (soil profiles)

This animation demonstrates different types of soil.


ATP is the main source of energy for cells.


Jellyfish are free-swimming marine animals, a species of Cnidaria, the most ancient group of Eumetazoans.


NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.

Solomon's Temple (Jerusalem, 10th century B.C.)

Solomon's temple became one of the most important symbols of Jewish architecture.

Effects of smoking on the lungs

Smoking severely damages the respiratory system, it may cause COPD or lung cancer.

Blue whale

Marine mammals, the largest known animals to have ever existed.


Regular dice can be used for solving statistical and probability exercises.

Emperor penguin

Penguins are birds living in the Antarctic and adapted to cold temperature and swimming.

European mole

Moles are small subterranean mammals with modified, spade-like forelegs.


One of the most important monocot crops.

Water supply system

The water supply system provides clean and safe drinking water for the consumers.

Types of surface epithelium

Surface epithelia cover the external and internal surfaces of the body

Wankel engine

A type of rotary engine of high efficiency

Red deer

Red deer are even-toed ungulates, ruminants. Their males have spectacular antlers.

Grass snake

A type of snake with a characteristic spot on its neck.

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