Larvae of this type of mayflies spend the first three years of their lives in water, their adult lives last for only one day which they use for mating.
The animation shows the way forces act on wheeled vehicles and vehicles with runners.
In ecology, a niche is a term describing the way of life of a species.
The process of the decay of unstable nuclei is called radioactivity.
This animation shows the hierarchical structure of the Medieval Christian church.
While the density of spider silk is less than that of nylon filaments, its tensile strength is greater than that of steel.
One of the positive influences of the Ottoman invasion of Europe was the construction of baths.
Solomon's temple became one of the most important symbols of Jewish architecture.
Every era and every culture has specific residential buildings.
Common salt is dissolved by water: polar water molecules form a coat around the ions.
Possible traces of water and life are sought on Mars.
Jupiter is the largest planet of the Solar System, it has two and a half times the mass of all the other planets combined.
During its orbit around the Earth, the visibility of the Moon's illuminated part constantly changes.
Machinery that pumps crude oil to the surface
Thermal power stations convert energy released during the combustion of fossil fuels or renewable resources into electricity.
Geothermal power stations convert energy of hot, high-pressure water found in deeper layers of the Earth into electricity.
The length of the metal frameworks of bridges change when the temperature changes.
Submarines submerge and surface by changing the average density of the hull.
Due to their asymmetrical profile of the wings, lift is produced while flying at a high speed.
An entertaining animation to practise orientation using a map.