A journalist asks a simple question: What evidence do you have? The answer comes back: I just look. (Donald Trump) It is hard to imagine a more revealing reply. “I just look” is not evidence. It is no
There is a familiar image used to explain Einstein’s theory of gravity. A heavy ball is placed on a stretched rubber sheet. The sheet bends “downwards”. Smaller balls roll towards the heavy one. We ar
Speed limit compliance depends on more than enforcement. It depends on clarity, consistency and credibility. Drivers are more likely to comply when the applicable limit is obvious, when the road itsel
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