Tornadoes tear though Tennessee, 25 dead

Tornadoes ripped through Tennessee early Tuesday, leaving at least 25 people dead, destroying buildings and toppling power lines hours before the southern US state voted in Super Tuesday primaries.

How we used drones to monitor coastal erosion in Ghana

Delta environments are low-lying and highly vulnerable to flooding and erosion by ocean waves. And these hazards are likely to increase as the world's climate changes and sea levels rise. Monitoring these hazards, and their ...

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