Ancient Persian monarchs were famous for the size of their empire and their wealth.
Pollen serves to fertilise the egg of plants. Pollen grains come in a variety of shapes and sizes, characteristic of the species.
This animation demonstrates several types of prisms, from general to regular.
A force can be measured by measuring the twisting of the torsion wire in a torsion balance.
This animation demonstrates how electric steam irons work.
African tribes have their own distinct cultures.
A type of settlement that has central functions.
Didžiosios Britanijos Karališkasis laivynas, vadovaujamas admiralo lordo Horacijaus Nelsono, nugalėjo Prancūzijos ir Ispanijos laivyną Napoleono karų mūšyje.
Woodwind instruments differ from brass instruments mainly in their reed.
This animation demonstrates the structure and operation of impulse turbines.
The surface of a sphere consists of the set of points which are all at the same distance from a given point in space.
Dogs are the domesticated subspecies of grey wolves.
This animation demonstrates the use of modern technology in agriculture.
A colourful and entertaining animation to practise orientation in space.
Combine harvesters are machines that harvest and thresh grain crops.
Find views and nets of three-dimensional shapes.
The Roman army, led by Flavius Aetius, stopped the Hun invasion led by king Attila
One of the best known species of spiders, often kept as pets. Its bite is not fatal for humans.
This animation demonstrates the construction of motorcycles.
German sordiers in the First World War were well trained and used modern weapons.