[Published entries]

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Common history: Salt Mine Wieliczka in Poland

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Longwaves – what are they and how they work?

Longwave radio frequencies are those below 500 kHz, which correspond to wavelengths longer than 600 meters.
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What is ionosphere?

The ionosphere is the part of the atmosphere that is ionized by solar radiation, and too tenuous to be cooled by contact with other
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About Zyklon B

Zyklon B was the tradename of a pesticide ultimately used by Nazi Germany in some Holocaust gas chambers. The reason why it was called
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Headstone – show their history

A headstone, tombstone or gravestone is a marker, normally carved from stone, placed over or next to the site of a burial.
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Electricity from Bacteria

Each year, wastewater treatment plants use enormous amounts of energy to rid water from our homes and businesses of waste products.