Fehling's test

If we add formaldehyde to the Fehling’s reagent, copper metal can form with a bit of luck.

The silver mirror test

If we add formaldehyde to the Tollen’s reagent and heat it, the silver ions reduce to...

Mediterranean climate

It is characterised by dry, hot summers and mild winters.

Flower indicator

Purple and wine red flowers can be used as pH indicators.

Baroque architecture

The impressive architecture of the Baroque era fascinates everybody even today.

Gothic architecture

Gothic art is one of the most important styles of the Middle Ages.

Glowing heart

We burn a heart in a piece of paper with the help of oxygen produced upon the...

Plitvice lakes

Croatia’s stunning system of lakes is included on the list of World Heritage Cultural Sites.

The process of physical and chemical weathering

Upon physical weathering the rock only falls into pieces, whereas during chemical...

Let's collect waste separately!

The most useful way to reduce mountains of waste is waste separation.

Air transport

Air transport has become the fastest, most reliable and most popular form of travel.


Loess is a clastic, predominantly silt-sized sediment, which is formed by the...

Global environmental problems

In order to protect our environment we must establish a sustainable world. The following...

Separate waste collection

Separate waste collection is probably the simplest way for us to contribute to the...

Europe after the First World War

The social, economic and political consequences of World War I in certain countries.


A mineral is a naturally occurring substance that is solid and stable at room...

The Paris peace treaties

This video presents the events of the peace conference in Versailles after the end of...

Suburban areas

Due to lower real estate prices, people and industry often move from big cities to...


The lakeside is the natural habitat for a number of species. Here you can find duckweed,...


Camping is a perfect outdoor recreational activity. A popular form of camping is wild...

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