‘This? It is called a Pensieve,’ said Dumbledore.’ I sometimes find, and I am sure you know the feeling, that I simply have too many thoughts and memories crammed into my mind.’ ‘Er,’ said Harry, who couldn’t truthfully say that he had ever felt anything of the sort. ‘At these times,’ said Dumbledore, indicating the stone basin,’ I use the Pensieve. One simply siphons the excess thoughts from one’s mind, pours them into the basin, and examines them at one’s leisure. It becomes easier to spot patterns and links, you understand, when they are in this form.

前些天打快递的电话，都是 AI 应答，知识星球是不是可以做类似的？

但回过头来，我自己的感受并不好，是因为我一下就听出是 AI 导致的？

Duolingo 做得很好的一点是：几乎每个页面都只有一个按钮，让用户养成了无脑点下一步的习惯 。

Duolingo 的通知策略：如果今天没来，会在前一天打卡后的 23.5 小时，push 一条消息。逻辑是：昨天这个时间有空，最有可能今天这个时间会有空。昨天晴天，最有可能今天晴天。

微信输入法这个对话式的设置，还蛮新颖的。