请问HN：如果将一项重大发现推迟几十年，最主要的变化是什么？
思想实验：选择一个科学或技术突破，想象它在意义上晚到了一段时间。这将如何改变历史的轨迹？
为了保持趣味性：
* 保持合理性——想想“晶体管延迟了40年”，而不是“直到2100年才有电”。
* 参与其中。适度悬置怀疑，使其变得有趣。
* 关注后果，而不是缺失的发明。这将如何改变历史的走向？
回顾历史，进步常常显得不可避免，但实际上它是一系列幸运的偶然事件。改变其中一个事件的时机，一切后续的事情都会发生变化。你的平行宇宙是什么样的？
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Thought experiment: Pick one scientific or technological breakthrough and imagine it arrived meaningfully later. How does that change the trajectory of history?<p>To keep this interesting:<p>* Keep it plausible—think "transistors delayed 40 years," not "no electricity until 2100."<p>* Play along with it. Suspend disbelief enough to make it interesting.<p>* Focus on the _consequences_, not the missing invention. How does this alter the arc of history?<p>Progress often feels inevitable in hindsight, but it's really a sequence of lucky breaks. Change the timing of one, and everything downstream shifts. What's your parallel universe?