What does the “Schengen Agreement” primarily concern?

Sputnik 1, launched by the USSR in 1957, was the first artificial satellite, marking the start of the space race.

Russia is the largest country by land area, spanning Eastern Europe and northern Asia across eleven time zones.

Ozone’s formula is O3, consisting of three oxygen atoms, playing a vital role in absorbing harmful UV radiation in Earth’s stratosphere.

The Maastricht Treaty (1992) created the European Union, creating new institutions and setting paths to monetary union.

The Schengen Agreement allows passport-free travel across many European countries, facilitating movement and integration in the EU.