Trench network (World War I)

Static warfare was one of the characteristics of WWI

AH-64 Apache (USA, 1975)

The Apache attack helicopter, named after an American Indian...

Wind power station

Wind power stations convert the kinetic energy of the wind into...

Ancient agriculture in the Nile Valley

Ancient Egypt was called the ‘gift of the Nile’, since the river...

V-2 ballistic missile (1944)

The German liquid-propellant rocket, developed during WWII, was...

What kind of food should be on your plate?

This animation helps you learn the basics of healthy eating.

Supermarine Spitfire (United Kingdom, 1938)

Spitfire was a legendary British single-seat military aircraft...

B-17 Flying Fortress (USA, 1938)

The ´Flying Fortress´ was developed for the United States Army Air...

Fokker Dreidecker I (1917)

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

Sphere

A sphere is the set of points which are all within the same...

Waterfall

Waterfalls form where the river flows over a steep precipice in...

Reaction of ammonia with hydrogen chloride

Ammonium chloride is the result of the reaction of ammonia and...

Reaction of zinc with hydrochloric acid

The dissolution of zinc in hydrochloric acid produces hydrogen gas.

Producing ammonia from nitrogen gas and hydrogen gas

Large-scale ammonia production requires high temperature and...

Addition

Addition is a reaction in which the molecules of two or more...

Great Mosque of Djenné (1907)

The mosque, built in a distinctive architectural style, is the...

Dissolution of hydrogen chloride (HCl) in water

The solution of hydrogen chloride in water is called hydrochloric...

Reaction of hydrogen with oxygen

Knallgas is the mixture of hydrogen and oxygen. It will explode...

Apple tree

The apple is one of the most popular fruits around the world.

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