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The French flag flies over flowers, candles and messages in tribute to victims outside the Le Carillon restaurant a week after a series of deadly attacks in Paris, France last November. Charles Platiau/Reuters

When fear is a weapon: how terror attacks influence mental health

It is probably not a surprise that a terror attack can have a major impact on people’s mental health. But what sort of effects are common, and how long do they last?
Volcanoes produce large amounts of a gas that interacts with air to produce sulfate aerosols, which act as tiny mirrors in the atmosphere to reflect sunlight – and heat. NASA

Can solar geoengineering be part of responsible climate policy?

Blocking the sun by injecting tiny particles in the atmosphere – called solar geoengineering – can lower the Earth’s temperature but has some real costs. Economists run the numbers.
A woman sits on a curb at the scene of a shooting on the Las Vegas Strip, Monday, Oct. 2, 2017, in Las Vegas. AP Photo/John Locher

Six things to know about mass shootings in America

In the wake of the tragedy in Las Vegas, a criminologist reviews recent research to dispel common misconceptions about mass shootings.
Parents and students view a memorial marking the one-year anniversary of the shooting that claimed 17 lives at Marjory Stoneman Douglas High School in Parkland, Fla. Reuters/Joe Skipper

Is suicide contagious?

Learning about a friend’s suicide attempt appears to transform a distant idea into something very real. Should this change the way we talk about suicide?
Advances in HIV treatment have turned it into a chronic, but manageable, illness. In this photo: Artist Damien Hirst’s ‘Where there’s a will there’s a way,’ which shows antiretroviral drugs in a medicine cabinet, is seen as it is displayed at a gallery in New York, February 4 2008. Chip East/Reuters

How HIV became a treatable, chronic disease

Thanks to treatment advances, people with HIV can and do live long and full lives. And that has led to a challenge that doctors and patients may not have imagined 35 years ago: the aging HIV patient.
People donate money during a flash football game organized by Arlington High School football player Max Gray, 18, to raise money for Jonielle Spiller, the mother of youth football player Jovon “Jo Jo” Mangual, 13, who died during the Oso mudslide, in Arlington. Jason Redmond/Reuters

Want to do something good for your health? Try being generous

Stepping toward better health (and happiness) may be as simple as spending your next $20 generously.