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"Starting a conversation about capitalism is like walking up to a stranger and asking, 'Can I talk to you about Jesus?'" says artist Steve Lambert. The best way to talk about the C-word, he says, is to make it personal. His giant art installation in New York challenges passers-by to weigh in.

In the 1980s, Stephen Crohn was exposed to HIV but never became infected. Throughout his lifetime, he helped scientists discover a genetic mutation that keeps HIV from infecting the immune system. Crohn died in August at age 66. A doctor who worked with him reflects on his contributions to science and the fight against AIDS.

Scientists went on a hunt for human guinea pigs to test out a new vaccine — and they got them!

Several species of parrots in Southeastern Peru regularly gather at a cliff face in the Amazon basin to eat clay. So do other animals, including humans.

Liuba Grechen Shirley, a Democratic congressional candidate in New York, is petitioning the Federal Election Commission to use campaign funds for child care while she devotes time to running for office.

The Santa Ana winds gave firefighters a small reprieve but were expected to pick up once again. Air quality was at hazardous levels in some areas.

Since the rollout of HealthCare.gov, many have wondered whether a private company could have avoided the federal site's many pitfalls. Oregon took that route, hiring Silicon Valley titan Oracle to create its state insurance exchange. But two months after its scheduled launch, the website is still not working.

A brain implant already used to treat severe epilepsy might also help fend off impulses to abuse drugs or overeat before they happen, researchers say. But so far it's been tested mostly in mice.

The danger for the U.S. is that Trump's reported slurs make China an even more enticing partner for African nations, writes British-Somali journalist Ismail Einashe.

Quick and inexpensive genetic sequencing is offering a glimpse of the microbes inhabiting our bodies. One woman volunteered to have her microbes cataloged. Her mom, husband and dog did, too.