Red deer

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

European honeybee

Honeybees produce a sweet and nutritious substance, honey.

Ancient Egyptian sailing boat

The river and marine sailing boats of ancient Egypt were one-masted, oared boats

Southern wood ant

An ant colony consist of a queen, male ants and workers.

The history of human migration

The migration of large human populations began in Ancient times.

Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.

Water supply system

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

Types of gears

Two meshing gears transmit torque during their rotational motion.

Traditional Eskimo lifestyle

Igloos were the typical dwellings built by Eskimos living in the Arctic zone.

Air pollution

This animation demonstrates the main sources of air pollution: agriculture, industry and urban settlements.


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

Mongol Khan (13th century)

The ruler of the vast Mongol Empire was the Khan.

Tooth brushing

Careful tooth brushing is an important part of oral hygiene.

Volume of a tetrahedron

To calculate the volume of a tetrahedron we start by calculating the volume of a prism.

Hot air balloon

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


The bell is a percussion instrument and an idiophone. Many types of bells exist.

Cockchafer (Maybug)

The cockchafer (or maybug) is a widespread bug in Europe. Its larvae, known as chafer grubs are considered a pest.

Location of origin of livestock and crops

Domesticated animals and crops originate from various parts of the world.

Battle of Issus (333 BC)

The battle ended with the overwhelming victory of the Macedonian army over the Persian army led by Darius III.


Oases are areas in deserts where water is available.

Added to your cart.