What kind of electoral system is the best? This question, easy to formulate in theory, has considerable practical significance. However, the answer is as widely known as it is disappointing: it has been shown that, given certain reasonable conditions, there is no such thing as a perfect voting system. This is the upshot of several different mathematical discoveries made in the latter half of the 20th century.

Water and fire are thought of as extreme opposites. So what does water have in common with the great fireballs known as stars? Data from the Herschel Space Observatory indicate that young stars are where water molecules are formed.

The epistolary novel genre evolved from the art of letter writing, as well as from the 18th-century fashion of witty salon conversations centered around games, intrigue, understatement, quips and emotional manipulation. Does the Polish literature and history of the period reflect these conventions?


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