All of the Nuremberg trials were recorded on 1,942 gramophone records but using a needle to play them — to digitize them — could also damage them. So, a scientist found a way to use photos to create sound.
In Geneva, the Kofi Annan Foundation announced his peaceful death after a short undisclosed illness with "immense sadness", saying he was surrounded in his last days by his second wife Nane and children Ama, Kojo and Nina.
The World Meteorological Organization says atmospheric concentrations of CO2 surged to a new record level in 2016. That puts even greater pressure for countries to cut carbon pollution to avoid catastrophic climate change.
Staffan de Mistura ruled out any breakthrough at this week's negotiations to end a war that has claimed more than 320,000 lives and displaced more than half of Syria's population. But he pointed to a new ceasefire brokered with US and Russian help, covering three provinces in southern Syria, as one source of hope.
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