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Located in the Grand Mosque of Makkah, the Kaaba shrine is the most sacred site of Islam.
These tools, revolutionary even in their simplicity, are still in use today.
The dentition of different species of mammals reflect their feeding habits.
A type of prehistoric reptile having bony plates on its back, which aided thermoregulation.
A liquid-crystal display utilises the light modulating properties of liquid crystals.
An extinct group of Cephalopoda, with solid external skeletons. They are excellent index fossils.
The ancient city located near the river Euphrates was an important Sumerian centre.
The name of the Russian armoured cruiser became well known during the October Revolution of 1917.
Before the American Civil war the use of slaves on plantations was typical in the Southern states.
As opposed to opencast mines, in underground mines, the layers covering coal are not removed; coal is extracted through mine shafts.
A mammal with features typical of reptiles: it lays eggs and has a cloaca.
A spacecraft moving on its path is in a constant state of free fall.
Industrial estates provide infrastructure and services for companies.
The church consecrated to Saint Basil was commissioned by Ivan the Terrible.
This animation demonstrates different types of soil.
The ancestors of Arachnida and Crustacea belonged to the class Trilobita.
A group of fish characterised by a cartilaginous skeleton, well-known species include the great white shark and the great hammerhead shark.
Several analogous types of eyes have developed independently through convergent evolution.
A prehistoric flying reptile, similar to birds. However, there is no direct evolutionary link between the two.
Trolleybuses and trams are environment-friendly means of public transport
This animation demonstrates the most important equipment of ambulance cars.
This animation explains how a plasma display television works.
This animation demonstrates how a CRT television works.
This animation demonstrates how mobile phones work.