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Ahmaud Arbery’s best friend, right, and his sister speak at a memorial event for Arbery on May 9, 2020. Sean Rayford/Getty Images

Why cellphone videos of black people’s deaths should be considered sacred, like lynching photographs

The US has a centuries-old tradition of killing black people without repercussion – and of publicly viewing the violence. Spreading those images can disrespect the dead and traumatize viewers.
Pairing widespread testing with fast, effective contact tracing is considered essential for controlling the coronavirus’s spread as the U.S. passes 100,000 deaths. AP Images/Rick Bowmer

How coronavirus contact tracing works in a state Dr. Fauci praised as a model to follow

Since the state's first coronavirus case surfaced, trained case investigators have traced the contacts of every person who tested positive. Here's what else South Carolina got right.
Artisanal small-scale gold mining polluted this stream and deforested sections of the Madre de Dios area of Peru. Mario Tama/Getty Images

Gold rush, mercury legacy: Small-scale mining for gold has produced long-lasting toxic pollution, from 1860s California to modern Peru

Small-scale gold mining operations in developing countries are major sources of toxic mercury pollution, using techniques that haven't changed much since the California Gold Rush 150 years ago.
Diligence, technological progress and a little luck have together solved a 20 year mystery of the cosmos. CSIRO/Alex Cherney

Half the matter in the universe was missing – we found it hiding in the cosmos

Cosmologists had only been able to find half the matter that should exist in the universe. With the discovery of a new astronomical phenomenon and new telescopes, researchers just found the rest.
View of blood collection tubes in a rack on the first day of a free COVID-19 antibody testing event at the Volusia County Fairgrounds, in DeLand, Florida. Paul Hennessy / Echoes WIre/Barcroft Media via Getty Images

Why COVID-19 immunity passports may violate US law

Amazon and General Motors are among companies exploring ways to test employees for COVID-19 infection, but these measures may be against the law.
Some of the highest coronavirus hospitalization rates in Denver are in neighborhoods near Valverde, a community that was once redlined. RJ Sangosti/Denver Post via Getty Images

Is your neighborhood raising your coronavirus risk? Redlining decades ago set communities up for greater danger

Neighborhood characteristics like pollution from busy roads, widespread public transit use and lack of community-based health care are putting certain communities at greater risk from COVID-19.
Website defacing can shut down businesses that have moved online during the coronavirus pandemic. Siriporn Kaenseeya/EyeEm via Getty Images

The coronavirus pandemic moved life online – a surge in website defacing followed

Vulnerable websites are popping up as organizations move online during the coronavirus pandemic – and hackers have more time at home alone. The result is more websites falling victim to defacement.