Cuboid

A cuboid is a polyhedron with six rectangular faces.

Deinonychus

Deinonychus antirrhopus, the 'terrible claw', was a carnivorous dromaeosaurid dinosaur.

Addition

Addition is a reaction in which the molecules of two or more substances unite without the formation of a by-product.

Reaction of ammonia with hydrogen chloride

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

Sphere

A sphere is the set of points which are all within the same distance from a given point in space.

Reaction of zinc with hydrochloric acid

The dissolution of zinc in hydrochloric acid produces hydrogen gas.

Dissolution of hydrogen chloride (HCl) in water

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

Reaction of hydrogen with oxygen

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

Dissolution of NaCl

Common salt is dissolved by water: polar water molecules form a coat around the ions.

Melting and freezing

During freezing hydrogen bonds are formed between water molecules resulting in a crystal structure.

Polymerisation of ethene

Polymerised ethylene is known as polyethylene, a type of plastic.

Habsburg imperial couple (19th century)

Emperor Franz Joseph I and the beautiful Elisabeth got married in Vienna in 1854, but their marriage was unfortunately an unhappy one.

Cylindrical solids

This animation demonstrates various types of cylindrical solids as well as their lateral surfaces.

Thyroid gland

An important endocrine gland producing hormones that affect metabolism and the calcium balance of the body.

Vertebrate brain evolution

During the evolution of vertebrates the relative development of brain areas has changed.

RT-2PM Topol Intercontinental ballistic missile (Soviet Union, 1985)

A mobile, nuclear-capable ballistic missile developed at the end of the Cold War.

Ancient agriculture in the Nile Valley

Ancient Egypt was called the ‘gift of the Nile’, since the river played an important role in the rise of Egyptian civilisation.

AH-64 Apache (USA, 1975)

The Apache attack helicopter, named after an American Indian tribe, was developed for the United States Army.

Trench network (World War I)

Static warfare was one of the characteristics of WWI

V-2 ballistic missile (1944)

The German liquid-propellant rocket, developed during WWII, was the first known man-made object to reach space.

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