Michael McBrayer tests his blood sugar before eating lunch. He gets supplies he needs to manage diabetes for free as part of a deal between his employer and health insurer. Evan Frost/MPR News hide caption

Film stills from Chicago Police Department video of a violent altercation between a 22-year-old drug dealer and Leo, 15, who was shot and paralyzed from the chest down. Chicago Police Department hide caption

Thoreau was born 200 years ago, on July 12, 1817. He died of tuberculosis at age 44. Hulton Archive/Getty Images hide caption

Donald Trump Jr., seen in the Trump Tower lobby in November 2016, met with a Russian lawyer after being promised damaging information about Hillary Clinton in June 2016. Drew Angerer/Getty Images hide caption

The massive crack first opened up in the Larsen C ice shelf back in 2014; by the end of last week, a roughly 3-mile sliver of ice was all that connected the iceberg to the shelf. John Sonntag/NASA hide caption

A new multi-story residential building (left) and an older style one-story space sit side by side on 12th Street in the East Austin neighborhood of Austin, Texas. The neighborhood has experienced a strong wave of gentrification, which often pushes people out of the now trendy area. Gabriel Cristóver Pérez/KUT hide caption

Image of a CAR-T cell (reddish) attacking a leukemia cell (green). These CAR-T lymphocytes are used for immunotherapy against cancer (CAR stands for chimeric antigen receptor). After the proliferation of the CAR-expressing T cells, they are transfused back into the patient and can directly detect the cancer cells carrying the antigen. Eye of Science/Science Source hide caption