Fuel cell

A fuel cell provides environment-friendly electric energy produced by the chemical reaction between oxygen and hydrogen.

Sulfurous acid (H₂SO₃)

Colorless, moderate acid, only known in aqueous solution.

Shale gas

This animation explains the technology of shale gas extraction.

Vision correction

Concave and convex lenses are used for the correction of shortsightedness and farsightedness.

North River Steamboat (Clermont) (1807)

Robert Fulton American engineer created the first operational steam-powered ship.

Colonization and decolonization

The colonizing powers´ colors were wiped off the map by the nations fighting to regain their independence.

Bireme (ancient oared warship)

A bireme is a type of ancient warship, with a characteristic pointed bow and two decks of oars, used by many armies.

Tutankhamun’s tomb (14th century BC)

One of the greatest archeological finds of the 20th century was the tomb of the Egyptian pharaoh.

Fat-tailed scorpion

The fat-tailed scorpion is one of the world's most dangerous scorpions.

Fokker Dreidecker I (1917)

The German triplane was perhaps the best known plane in World War I.

Sailing ships

Schooners, first built in the Netherlands in the 17th century, were mainly used as merchant ships.

Battle of Marathon (490 B.C.)

The marathon running event was instituted in commemoration of the run of a Greek soldier after the Battle of Marathon, fought between the Athenian and the...

De Havilland DH-106 Comet 1 (1949)

The aircraft manufactured by the British de Haviland company was the world's first mass-produced commercial jetliner.

Oil refinery

The products of oil refining include diesel oil, petrol and lubricants.

Continental drift on a geological timescale

The Earth's continents have been in constant motion during the history of the planet.

USS Tarawa LHA-1 (1976)

From the 1940s, the increasingly large aircraft carriers became the masters of the oceans.

Voyager space probes

The Voyager space probes were the first man-made objects to leave the Solar System. They gather data about outer space and carry information about humanity.

Face-centered cubic metal lattice

The face-centered cubic metal lattice allows the closest fit of metal atoms.

Ferrous metallurgy (intermediate)

Raw iron is produced from iron ore in iron smelters.

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