Conic solids

This animation demonstrates various types of cones and pyramids.

Solids of revolution (exercise)

An exercise about the generation of solids of revolution.

The Great Stupa (Sanchi, 2nd century BC)

The masterpiece of Buddhist architecture is located in India.

Shape games

Find views and nets of three-dimensional shapes.

Firearms

Competing with each other in the 19th and 20th centuries, the world´s most powerful nations made great efforts to develop effective firearms.

Granary in the Indus Valley

Ancient Indians built huge, naturally ventilated storehouses.

Relative position of lines and planes

This animation demonstrates the relative position of lines and planes.

Ancient Indian war elephant

Ancient Indian war elephants were used as ´tanks´ in battles.

Precision agriculture

This animation demonstrates the use of modern technology in agriculture.

Battle of Zama (202 BC)

Scipio’s Roman army defeated Hannibal’s Punic army in the battle fought during the 2nd Punic war in Africa.

Ancient Greek merchant ship

Ancient Greeks became the ‘carters of the sea’ thanks to their advanced sailing ships.

Sulphur (S₈)

An odourless, yellow, solid substance, the 16th most common in the Earth´s crust. One of the best known sulphur compounds is pyrite, also known as ´fool´s...

Phenol (C₆H₅OH)

The simplest of the aromatic hydroxy compounds.

Sulphuric acid (H₂SO₄)

A colourless, viscous liquid, a highly corrosive, strong acid used in several industrial processes.

Amylose ((C₆H₁₀O₅)n)

A helical molecule consisting of alpha-D-glucose units. It is one of the basic components of starch.

Hypochlorite ion (OCl⁻)

Hypochlorite ions are formed when water is disinfected with chlorine.

Bromofluorochloromethane (CHClBrF)

The molecule has two enantiomers: stereoisomers that are mirror images of each other and are not superimposable.

Sulphur dioxide (SO₂)

Sulphur dioxide emission is the main cause of acid rains. It is an intermediate product in the production of sulphuric acid.

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