Long-tailed mayfly

Larvae of this type of mayflies spend the first three years of their lives in water, their adult lives last for only one day which they use for mating.

Triceratops

A type of herbivorous dinosaur easily recognisable by its large frill and three horns which lived in the Cretaceous period.

Comparison of real fruits and pseudofruits

The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.

Ottoman soldiers (16th century)

The Ottoman army included janissaries (paid warriors) and sipahis (vassal knights).

Southern wood ant

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

European honeybee

Honeybees produce a sweet and nutritious substance, honey.

Chlorophyll

Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.

Public school in Central Europe (early 20th century)

Public schools in villages played an important role in education.

System of public utilities

System that satisfies consumers’ demands of water supply, wastewater disposal, electricity, heat and gas supply and telecommunication.

Air pollution

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

Airport

Airports provide infrastructure and services necessary for aviation.

Port

Ports must provide necessary infrastructure and services for industry and marine transport.

Northern white-breasted hedgehog

The Northern white-breasted hedgehog rolls into a ball to protect itself.

Medieval Chinese Emperor

The Emperor of the vast Far-Eastern empire was the lord of life and death.

Battle of Issus (333 BC)

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

Types of gears

Two meshing gears transmit torque during their rotational motion.

The Knights Templar (12th-13th century)

One of the most important religious military orders, formed in the era of the Crusades.

Medieval keep

Keeps were typical buildings in the Middle Ages, also built independently from castles.

Hubble Space Telescope

The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.

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