Heiko Matthies, from the Westerwald region, works 100 meters above ground. He checks the huge blades on wind-turbines for possible damage -- and makes repairs where necessary.
Anthropologist, historian, specialist in nuclear physics and passionate about linguistics, the Senegalese scholar Cheikh Anta Diop laid the foundation for finally writing the history of Africa without racist prejudices.
After suspending top scorer Pierre-Emerick Aubameyang, Borussia Dortmund failed to take their chances against draw specialists Wolfsburg. BVB struck the woodwork twice but couldn't make their dominance count.
Water power is the largest renewable energy source in the world, but some plants are running out of water due to severe droughts. Is climate change jeopardizing the future of hydropower plants?
On day six in Rio, Fiji's rugby sevens team etched themselves into the history books, gymnastics star Simone Biles clinched her second gold and Michael Phelps reached 22 gold medals.
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