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The Hubble Space Telescope orbits outside the distorting influence of Earth´s atmosphere.
Soccer is one of the most popular team sports due to its relatively low equipment...
The Global Positioning System consists of 24 satellites but only 4 have to be visible for...
Pollution is the negative effect of human activity on the natural environment.
Tourism is a significant sector of the economy that grows continuously all around the world.
Villages are localities with relatively small populations and only local administrative powers.
The rolling highway (Rollende Landstrasse) is an environmental friendly way of transportation...
This animation demonstrates the main sources of soil pollution.