Delhi suffocates under toxic smog but millions go without masks

A thick grey smog choked New Delhi for the fifth day Saturday, adding to a mounting pollution health crisis, but retired naval commander Anil Charan is one of the vast majority of the city's 20 million inhabitants who do ...

Keeping dark matter detectors clean and accurate

A research team at South Dakota School of Mines & Technology has built an air purifier that has reduced the radon in the air to about 50 times lower than typical outdoor air. The team is helping to ensure success for one ...

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