Pollen serves to fertilise the egg of plants. Pollen grains come in a variety of shapes and sizes, characteristic of the species.
World War I brought major changes in military technology, due to the development of new weapons.
Typical flats characterise the culture of the decade.
The Tower of Hanoi is a mathematical puzzle.
Simple harmonic motion can be considered to be the one-dimensional projection of uniform circular motion.
A force can be measured by measuring the twisting of the torsion wire in a torsion balance.
This animation demonstrates the construction of motorcycles.
Colourless, odourless gas, highly toxic to humans and animals in high concentration.
One of the best known species of spiders, often kept as pets. Its bite is not fatal for humans.
The dreaded warriors of the Mongol Empire helped to make it one of the largest empires in history.
This animation demonstrates the construction of a fire engine.
A compound ion produced from carbonic acid by releasing protons.
This animation demonstrates the most important equipment of ambulance cars.
The Global Positioning System consists of 24 satellites but only 4 have to be visible for positioning.
In the battle fought at the shores of Hellas, Octavian won a decisive victory over Marcus Antonius.
This animation demonstrates birds' bones and eggs through the example of the common blackbird.
Direct action pumps and suction pumps are among the simplest water pumps.
One of the most beautiful Art Nouveau buildings in Hungary.
Saving energy and protecting the environment are important factors in the design of modern office buildings.
An acyl-carrier coenzyme taking part in both anabolic and catabolic processes.