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" ... At the end of 2018, Ida Lane, 63, was jobless, living in a Chicago homeless shelter and facing an uncertain future. Today, she resides in a subsidized apartment and earns $20 an hour as a part-time Covid-19 contact tracer. ... "
" ... Have you heard about the Covid-19 contact tracer scam? It’s when a con artist calls pretending to be a contact tracer and asking you for your Social Security number or a payment for its tracking services. Pennsylvania’s departments of health and aging have been warning residents about this. ... "
" ... Researchers in The Netherlands have tested a fluorescent tracer dye tethered to a cancer drug, which may help surgeons more accurately remove breast tumors and preserve healthy tissue. ... "
" ... We know how bright the Cepheid should be, because of its pulse, so any fainter means it’s farther away. We know how brightness fades with distance - twice as far away means eight times as faint. The mismatch between how bright the Cepheid appears in the sky, and how bright it should be gives us this distance. This method works well throughout our galaxy and out to the nearest galaxies beyond us. To go even farther out in the universe, we need an even brighter tracer - supernovae. ... "