Counterfactuals Causal inference is easier when the effects are large and sudden. The COVID-19 pandemic and accompanying policy measures caused economic disruption so stark that sophisticated statistical approaches were unnecessary for many questions. For example, unemployment jumped sharply in the early weeks of the pandemic, leaving little room for alternative explanations.
在我们评测华为「二合一」产品 MatePad Edge 时，编辑部那些伴随着平板长大的年轻同事，虽然 80% 的工作时间都在用键鼠，但也会自然地经常伸手点击屏幕，甚至换回 MacBook 后还有点不太习惯。
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Nature, Published online: 04 March 2026; doi:10.1038/s41586-026-10212-4
The continuous movement of the vocal cords weakens and eventually stops as laryngeal cancer progresses. For the first time, researchers have discovered that restoring cellular vibration, for example by playing music to cancer cells, reduces the aggressiveness of advanced vocal cord cancer.
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value is simply the last element of the state tuple.
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