内容摘要：The Met says the show "presents a cultural and historical examination of black style from the 18th Century to today,

The Met says the show "presents a cultural and historical examination of black style from the 18th Century to today,

A bullet travelling at supersonic speed first creates a sonic boom - often called a "crack". The sound of the bullet being fired is what creates a second sound, often called a "pop".At close distances, the two sounds are almost indiscernible to the human ear.

But by looking closely at the waveform of the audio, the two sounds can be detected and the distance between them measured.What Mr Maher describes as "crack-pop sequences" are visible in these waveforms.Mr Maher said the further away the firearm is from the microphone, the longer the gap between the two sounds.

Mr Maher said: "The first few audible gunshots have a crack-pop timing of about 72ms. Assuming a bullet speed of 800 m/s and speed of sound 343 m/s, that time gap implies the firearm was about 43 meters away. If the bullet speed were actually faster, that would move the firearm estimate closer to the microphone."There are limitations to their estimates. For example, analysts told us they cannot be certain of the type of firearm used or of the miss distance, which is how far off the shot is from the intended target. They also must make an assumption about the average speed of the bullet.

BBC Verify will continue to investigate this incident.

Millions more adults in England and Wales are believed to have experienced domestic abuse since the age of 16, after the Office for National Statistics (ONS) overhauled its crime survey."Europeans got what they wanted first, and then we had a haggle from a weak position."

So he adds, "If I was giving advice to the government, I would say, tough it out" and use fishing as a lever to seek concessions.But, as the UK found before, Brussels has cards to play. Much of the fish caught by British fishermen is sold to buyers on the Continent and the UK needs access to that market.

Some EU coastal states, like France and Denmark, are prepared to drive a hard bargain, demanding that London concedes on fishing rights in return for things it wants. Early on, even signing the Security Partnership was being linked to agreement on a fishing deal. The haggling will be tough.And finally, there's an idea that has prompted much interest in recent months: a youth mobility deal, through which under-30s from the UK and EU could live and work in each other's countries.