Science, Tech & Environment

A breakthrough may make the mega flow battery commercially viable in the near future

Wind and solar power have the potential to reduce the growth of greenhouse gases and slow the progression of climate change. But since the sun doesn’t always shine and the wind doesn’t always blow, the big hurdle in expanding the use of renewables is the lack of cheap and efficient storage of that energy. That could be about to change.

Health & Medicine

The fight is on over e-cigarettes

Electronic cigarette ads are on TV. New York City is restricting e-smoking in the same way as it restricts tobacco smoking. And government data indicates that 10 percent of high school students have tried e-cigs. Now, researchers are racing to figure out how they will impact public health.

Conflict & Justice

New York City's hijacked hashtag launches a global conversation on police brutality


When the New York Police Department encouraged its followers on Twitter to share photos of themselves with NYPD officers, the result was not what they expected. Two days later, the hashtag has been mimicked in a half dozen cities around the world to showcase police brutality. But the social media effort has had another consequence: it has started a global dialogue about the perception of police and policing in different cities.