Ozone layer

The ozone layer filters the Sun´s harmful UV radiation, therefore it is indispensable for...

The Earth’s magnetic field

The Earth’s magnetic North and South poles are located near the geographic North and...

The Solar System; planetary orbits

The orbits of the 8 planets in our Solar System are elliptical.

Lesser horseshoe bat

Bats use ultrasound to navigate and hunt for prey.

Maglev Trains

One of the most modern means of transport is the Maglev, capable of travelling at speeds...

Diesel engine

The German engineer Rudolf Diesel patented the diesel engine in 1893.

The science of candles

Candles have been used for lighting since ancient times.

Change of seasons (intermediate)

Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes...


A transformer is a device used for converting the voltage of electric current.

The Doppler effect

It is a well-known phenomenon that the sound of an approaching sound source is higher...

Thermal expansion of bridges

The length of the metal frameworks of bridges change when the temperature changes.


The process of the decay of unstable nuclei is called radioactivity.


The animation shows the way forces act on wheeled vehicles and vehicles with runners.

Kepler space telescope

The Kepler space telescope was launched by NASA to discover Earth-like planets orbiting...

Stirling engine - hot-air engine

Stirling engines are also known as external combustion engines. Unlike internal...

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

Continental drift on a geological timescale

The Earth's continents have been in constant motion during the history of the planet.

Surface tension

Surface tension is the property of a liquid that allows it to obtain the smallest surface...


There are various types of instruments used for measuring temperature.

The reflection and refraction of light

A ray of light is reflected or refracted at the boundary of two mediums with different...

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