In the dead of winter, a group of students set out on a trek into the Ural Mountains. Their frozen bodies - with inexplicable injuries - were discovered in locations that compounded the puzzle of how they died. Read more
Russia condemns the US ambassador to Poland for saying the Nazi-Soviet pact triggered World War Two.
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John Simpson
World Affairs Editor
The BBC's John Simpson recalls witnessing the communist bloc's collapse in three revolutions.
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Goar Vartanyan was credited with uncovering a Nazi plot to kill the "Big Three" allied leaders.
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The wave of revolutions in Central and Eastern Europe helped shape the continent for decades to come.
Read moreThe former Soviet leader warns that the tension between Russia and the West is a risk to the entire planet.
Tatsiana Yanutsevich
BBC News, Belarus
Works by Malevich fetch millions - but Belarus still has to prove that this is one of them.
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He exposed the practice of declaring dissidents mentally ill in order to detain and discredit them.
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Rob Cameron
BBC News, Prague
The identity of a 10th-Century skeleton fascinates experts - but was exploited by invaders.
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Paul Rincon
Science editor, BBC News website
Alexei Leonov, who died on Friday, could have been the first human to land on the Moon.
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