Today, hundreds of thousands of people will gather to mark "30 Jahre Mauerfall" in Berlin. For days, people have been streaming to open-air exhibitions at the Brandenburg Gate, the former headquarters of the Stasi, and other sites around the city that were part of the drama that culminated in the opening of the Wall on November 9, 1989. The celebrations will reach fever pitch Saturday evening as a concert by the Staatskapelle Berlin gives way to a massive techno and punk rock dance party that will carry on through the night at 27 different clubs across the German capital.

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Late last month, Google confirmed that a special kind of rig known as a "quantum computer" had performed an amazing feat. In just a few minutes, it managed to perform a calculation that would have taken the world's most powerful supercomputers thousands of years. The race to develop these computers is in, and it's not just computer nerds who are hyped up about this – the fight for "quantum supremacy," could one day have huge geopolitical implications too.

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It used to be that a country's sovereignty – its ability to do what it wants at home and abroad – depended mostly on military or economic clout. But in the digital age, when the ability to make sense of massive amounts of data will increasingly determine economic and military might, that's changing.

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It's just over 12 months until the US presidential election. So, how are you feeling? A bit on edge? Good, because against a tense geopolitical backdrop, and with an impeachment drama playing out in the House of Representatives, a series of recent headlines has left your Wednesday Signal author concerned that we could be heading for a perfect storm…of election meddling and other cyber mischief.

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Syria is quickly turning into US President Donald Trump's most significant foreign policy blunder to date. It's looking like it might be for Turkish President Recep Tayyip Erdogan, too.

On Monday, the Trump administration announced a fresh wave of sanctions on Turkey, in a bid to get Erdogan to halt his invasion of Kurdish-controlled territory in Syria. Yes, you may recall, that's the same invasion that the US green-lit last week by withdrawing American troops from the area.

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As China's leaders bask in the glow of the massive military parade and other festivities they held in Beijing on Tuesday to mark the People's Republic's 70th birthday, a quieter but potentially more significant test of China's global clout is playing out in the bustling tech hub of Shenzhen nearly 1,400 miles to the south.

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Who do you trust more with your money: Mark Zuckerberg or your country's central bank? It's not just a theoretical question: When Facebook launched its Libra digital currency project back in June, we predicted it would provoke a sharp response from governments.

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Say you're a government that employs a variety group of rebels, insurgents, terrorists, or freedom fighters to advance your national goals. Like any crafty strategist, you want to inflict maximal damage on your enemies while minimizing the potential blowback to yourself – while ideally avoiding excess costs and casualties among the people on your payroll.

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