Air pollution 'silent killer' in African cities: study

Pollution in Africa's fast-expanding cities is deadlier than thought, yet green solutions could save tens of thousands of lives and avert billions of dollars in damage, a report said Thursday.

What's the best way to build landing pads on the moon?

In the near future, NASA, the European Space Agency (ESA), China, and Roscosmos all mount crewed missions to the moon. This will constitute the first time astronauts have walked on the lunar surface since the Apollo era. ...

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