#胡说八道
有个段子说：有人问欧几里得，几何有什么用。欧几里得回头跟随从说，给丫的几个银币，丫居然想从几何学那里获益。
这个段子影响我很深：首先我觉得从不同的「有用」定义出发，理工科也可以是没用的。
其次就是我觉得「xxx有没有用」的答案也不重要。重要的是为什么要问这个问题——欧几里得就回避了这个问题。而且我觉得按当前的生产力，我们容得下一些人做无用之学。
https://www.tg-me.com/nl/telegram/com.danteslimbo/4601
BY Dante's Limbo
Launched in 2013, Telegram allows users to broadcast messages to a following via “channels”, or create public and private groups that are simple for others to access. Users can also send and receive large data files, including text and zip files, directly via the app.The platform said it has more than 500m active users, and topped 1bn downloads in August, according to data from SensorTower.
Some messages aren’t supposed to last forever. There are some Telegram groups and conversations where it’s best if messages are automatically deleted in a day or a week. Here’s how to auto-delete messages in any Telegram chat. You can enable the auto-delete feature on a per-chat basis. It works for both one-on-one conversations and group chats. Previously, you needed to use the Secret Chat feature to automatically delete messages after a set time. At the time of writing, you can choose to automatically delete messages after a day or a week. Telegram starts the timer once they are sent, not after they are read. This won’t affect the messages that were sent before enabling the feature.
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