Not all narcissists are loudmouth egotists, according to a growing body of science. There are also covert manipulators lurking in most social circles

Wildfires not only wreck homes and livelihoods, new research suggests that their smoke may affect mental health – and cause an increase in violent crime

A ghostly atmosphere has been detected around a minor planet beyond Neptune

Climate change is slowing Earth's spin – and there's nothing quite like it in 3.6 million years

At this point in time, black holes feel… inescapable. I’m not talking about their gravitational pull, but rather how every week seems to bring the publication of a new paper about these cosmic monsters. For such enigmatic objects, we hear an awful lot about them. This is mostly thanks to the discovery, made a little over 10 years ago, that we could detect and measure gravitational waves. When this happened, we found a new way to look at the Universe. Until then, we had relied on various types of sensors to collect light (X-rays, visible light, radio waves and so on) or particles, such as cosmic rays, to examine the Universe. All of which, famously, tell us almost nothing about black holes. But then, on 14 September 2015, we picked up the signal created by two black holes spiralling around each other and merging. The event didn’t create a flash or a bang; instead, it created a ripple in spacetime that surged towards us at the speed of light. Here on Earth, the Laser Interferometer Gravitational-wave Observatory (LIGO) picked up this vibration in the fabric of spacetime and, in doing so, gave us a new way to probe the Universe – and a means to investigate the behaviour of black holes. Fast forward to today, and LIGO and its new partners – the Virgo interferometer in Italy and the Kamioka Gravitational Wave Detector (KAGRA) in Japan – have become black hole hunters, tracking 300 mergers between them. The signals received and the measurements taken are slowly disrobing black holes of their secrecy. By analysing these signals, scientists can determine how a black hole formed, its mass and spin, its energy output and much more. We’ve discovered black holes are much bigger and much more common than we thought, and that there might be different generations spread throughout the Universe. And yet, we still haven’t been able to peer inside one. That final frontier still remains… or does it? Read this issue to find out.

Here’s how to avoid faecal disaster, even when your gut is primed to misbehave

The world's soils are degrading fast, and until now we've had almost no way of knowing what's happening underground

Research shows that garlic affects your lipid health as well as your taste buds. But how you take it plays a big role in how well it works

Meet the bearded vulture, known to use man-made objects in its nests which last generations and now act as 'natural museums'