内容摘要："Wine is an international product. Even here in the Napa Valley, our wineries primarily get their corks from Portugal, and their oak barrels, a key component in winemaking, from France.

"Wine is an international product. Even here in the Napa Valley, our wineries primarily get their corks from Portugal, and their oak barrels, a key component in winemaking, from France.

Three Ukrainians in different Russian-controlled cities have told the BBC of the pressures they face, from being forced to accept a Russian passport to the risks of carrying out small acts of resistance. We are not using their real names for their own safety, and will call them Mavka, Pavlo and Iryna.The potential dangers are the same, whether in Mariupol or Melitopol, seized by Russia in the full-scale invasion in 2022, or in Crimea which was annexed eight years before.

Mavka chose to stay in Melitopol when the Russians invaded her city on 25 February 2022, "because it is unfair that someone can just come to my home and take it out".She has lived there since birth, midway between the Crimean peninsula and the regional capital Zaporizhzhia.In recent months she has noticed a ramping up of not only a strict policy of "Russification" in the city, but of an increased militarisation of all spheres of life, including in schools.

She has shared pictures of a billboard promoting conscription to young locals, a school notebook with Putin's portrait on it, and photos and a video of pupils wearing Russian military uniforms instead of the school outfits - boys and girls - and performing military education tasks.Some 200km (125 miles) along the coast of the sea of Azov, and much closer to the Russian border, the city of Mariupol feels as if it has been "cut off" from the outside world, according to Pavlo.

This key port and hub of Ukraine's steel industry was captured after a devastating siege and bombardment that lasted almost three months in 2022.

Russian citizenship is now obligatory if you want to work or study or have an urgent medical help, Pavlo says.There is a growing view among some thinkers that as AI becomes even more intelligent, the lights will suddenly turn on inside the machines and they will become conscious.

Others, such as Prof Anil Seth who leads the Sussex University team, disagree, describing the view as "blindly optimistic and driven by human exceptionalism"."We associate consciousness with intelligence and language because they go together in humans. But just because they go together in us, it doesn't mean they go together in general, for example in animals."

So what actually is consciousness?The short answer is that no-one knows. That's clear from the good-natured but robust arguments among Prof Seth's own team of young AI specialists, computing experts, neuroscientists and philosophers, who are trying to answer one of the biggest questions in science and philosophy.