As NATO defence ministers gather in Brussels, uncertainty about the military alliance’s usefulness is growing. Critics point to NATO’s own blunders, as well as unpunished abuses by non-NATO states. How justified are these doubts?

NASA found that spending time in space can alter gene expression, hyperactivate the immune system, and boost DNA repair. But as space mining becomes the new Wild West, and Mars its far frontier, what toll might space travel take on humans?

When your twitter rants go unnoticed, it might brighten up your day to know that an AI machine is dissecting your post.

Shamima Begum, a British teenager who joined ISIS aged 15, now wants to return. Her family says she was a child who made a mistake, but public opinion is divided. Should IS recruits be repatriated or repudiated? And if they return, how should we proceed?

Top polluters China and India are leading the planet’s greening. Worldwide, enough leafy land has grown in the last twenty years to cover an area as big as the Amazon. So why isn’t that purely good news?

As NATO defence ministers gather in Brussels, uncertainty about the military alliance’s usefulness is growing. Critics point to NATO’s own blunders, as well as unpunished abuses by non-NATO states. How justified are these doubts?