The Tomorrow Today Viewer Question 19.03.2016 | 01:48 mins. Arsenio Alianza from Cavite City in the Philippines wants to know: What is the sound barrier?

Moscow 'waiting' for answers after US says ex-Putin aide died of blunt-force trauma to head 11.03.2016

A former adviser to President Putin was found dead in Washington last year. US authorities have named a different cause of death than what the Russian media had originally reported. DW's Emma Burrows reports from Moscow.

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