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As a former director of engineering of a defense-products company, I’m very aware of the explosive nature of sodium azide. I know that there have been serious explosions in industries (including the airbag industry) that use metal azides. A few reasons sodium azide may have been selected for use in airbags are it releases gas […]
- Health & Medicine
Lingering legacy of Sept. 11, 2001, on firefighters’ health
Of the New York firefighters involved in the rescue and recovery effort after last year's terrorist attacks, relatively few have developed chronic coughs and respiratory problems, but among those who did, the problems seem unusually severe.
- Astronomy
There’s life in the old galaxies yet
An unexpectedly large number of supermassive black holes in old galaxy clusters suggests these elderly groupings of galaxies aren't as quiescent as had been expected.
