Ozone layer

The ozone layer filters the Sun´s harmful UV radiation, therefore it is indispensable for...

Greenhouse effect

Human activity increases the greenhouse effect and leads to global warming.

Formation of stratovolcanoes

Stratovolcanoes consist of layers of volcanic ash, debris and lava.

Greek gods

The Olympian gods in ancient Greek mythology were as diverse as humans.

The Earth’s magnetic field

The Earth’s magnetic North and South poles are located near the geographic North and...

Pyramid of Djoser (Saqqara, 27th century B.C.)

The step pyramid, built in the 27th century B.C., was the first pyramid in Egypt.

Life cycle of mosses and ferns

This animation compares the life cycles of mosses and ferns, helping to understand the...

Zeppelin airship, LZ 129 Hindenburg

A Zeppelin is a type of rigid-framed airship.

Respiratory system

The respiratory system is responsible for the intake of oxygen and the release of carbon...

Viruses

Viruses consist of protein and DNA or RNA, they reprogram infected cells to produce more...

Electrical conduction system of the heart

Our heart generates the electrical impulses necessary for its own operation. The graphic...

Knossos Palace (2nd millenium B.C.)

The largest bronze-age building complex of ancient Crete was probably the center of...

Comparison of monocots and dicots

The two groups of angiosperms are monocots and dicots.

Daguerreotype

The first commercially successful technique of photography was invented by the French...

Atomic bombs (1945)

The atomic bomb is one of the most destructive weapons in human history.

The life-cycle of the Solar System

The formation of the Sun and the planets started with the contraction of a dust cloud...

Kaaba (Makkah)

Located in the Grand Mosque of Makkah, the Kaaba shrine is the most sacred site of Islam.

Bastille (Paris, 18th century)

The Parisian prison became legendary after the Revolution of 1789.

Airbus A380 (2005)

The double-decked, wide-bodied passenger aircraft can carry more then 500 passengers.

Medieval inhabited bridge (London Bridge, 16th century)

In the Tudor Era around 200 buildings were built on the bridge across the River Thames.

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