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Germany’s Deutsche Bahn rail system is not what it used to be, wrote a Traveler reader this week. Photo: iStock ICE IS NOT VERY HOT The once mighty Deutsche Bahn (German Rail), a symbol of punctuality, reliability and other German stereotypes, has fallen into a heap of ruin. Weekend trips on the main Berlin-Kologne route on DB’s flagship high-speed ICE had our trains canceled on the way there and again on the way back. For the latter, passengers are advised to board the next highly booked ICE, which is then completely overloaded. The highlight of the glory was the announcement that the train would not depart until people had unconditionally disembarked, and if not, the federal police would be called in to clean the train. Avoid as much as possible. Carsten Roever, Brunswick, Vic THIS WEEK’S LETTER AGE AGE In response to Lee Tulloch’s column ( Traveler July 9 ), in 2021, my wife and I will be attending a family reunion at Airlie Beach. When we tried to rent a car, we fo

In a world full of opposing views, let’s draw attention to something we all agree on: if I show you my pen, and then hide it behind me, my pen is still there – even though you can’t see it anymore. We can all agree that it’s still there, and probably the same shape and color as before it went behind me. This is just common sense. This common sense law of the physical world is universally understood by humans. Even a two month old baby shares this understanding. But scientists are still confused about some aspects of how we reach this fundamental understanding. And we haven’t built a computer that can compete with babies’ normally developing common sense abilities. New research by Luis Piloto and his colleagues at Princeton University – which I reviewed for an article in Nature Human Behavior – takes steps to fill this gap. Researchers created a deep learning artificial intelligence (AI) system that gains an understanding of some common sense laws of the physical world. The findin