<div dir="ltr">After tracking potholes, or Covid-19 exposure, or wild fires, comes<div><br><div><a href="https://www.technologyreview.com/2020/11/26/1012671/the-apps-keeping-rios-residents-safe-from-stray-bullets/">https://www.technologyreview.com/2020/11/26/1012671/the-apps-keeping-rios-residents-safe-from-stray-bullets/</a><br></div></div><div><br></div><div>-- rec --</div></div>