1.
2.
Schools are adding pepper-spraying drones to help combat active shooters
(news.ycombinator.com)
3.
Cursing the government does not fix potholes. Spray-painting them does
(news.ycombinator.com)
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5.
7.
Job titles of the future: Wildlife first responder
(technologyreview.com)
8.
10.
A New Way to Spray Paint Color
(spectrum.ieee.org)
14.
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16.
OTC nasal spray seemed to cut COVID infections by 67% in mid-sized trial
(arstechnica.com)
17.
19.