Africa - The Land of Anthropoids

A film about three great apes found in Africa: the chimpanzee, the bonobo and the gorilla.

Natural gas and petroleum

Natural gas and petroleum are among the most important sources of energy and raw materials today.

Test tutorial 5.

Let’s find out how to use the Test Editor tool.

The dandelion

Every March, children love plaiting wreaths of dandelions. Let’s find out more about this popular meadow plant.

The cymbal

When plates and membranes vibrate they deform spectacularly. These deformations, however, are hardly perceptible by the human eye, but are visible in...

Plotting a parallel line at a given distance

Line e is given. Let’s plot a line parallel to line e 2 cm away.

The conditions for rapid combustion

This experiement shows that combustion will not occur if any of the following is missing: combustible substance, oxygen or ignition temperature.

Mobile flood barrier

A temporary movable wall designed to contain overflowing rivers or other waterways.

The subtropics

The subtropics are located between the tropical and temperate zones, between 23.5° and 40° latitude in both hemispheres.

Masada

Masada, a fortress built on a gigantic isolated plateau, is a symbol of Jewish patriotism.

Elephant toothpaste

We prepare a special “elephant toothpaste” with some hydrogen peroxide, liquid soap and food colouring.

The effects of flowing waterbodies in the mountains

The greater the discharge and speed of the water, the stronger its surface-shaping force.

Reflecting a triangle across an axis

Axis t and triangle ABC are given on a particular plane. Let’s plot the mirror image of triangle ABC.

The history of lighting

Nowadays it is perfectly natural to turn on the lights. But it has not always been that way.

Art Nouveau architecture

Art Nouveau did away with all the previous eclectic styles in architecture and paved the way for the modern architecture of the 20th century.

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