安利一个讲科学史的 UP 主：长河劫 ( https://space.bilibili.com/35868098 )
挑两个视频推荐：
【技术史】晚清电报发展的崎岖历程 https://www.bilibili.com/video/BV1Qu4y1H7TP/
从摩尔斯电码的诞生讲到汉字电码编码，以及其对应的收费规则和与之而来的变化。
【科学史】一米应该有多长 https://www.bilibili.com/video/BV1ik4y177YX/
从度量衡到国际单位的演化过程，从地球普适单位讲到宇宙普适单位。
前几天刷推送的时候发现的，讲东西蛮有意思的，好看不火，希望能给你带来些新的知识。
BY 科技圈的日常
Tata Power whose core business is to generate, transmit and distribute electricity has made no money to investors in the last one decade. That is a big blunder considering it is one of the largest power generation companies in the country. One of the reasons is the company's huge debt levels which stood at ₹43,559 crore at the end of March 2021 compared to the company’s market capitalisation of ₹44,447 crore.
“To the extent it is used I fear it’s often for illicit finance. It’s an extremely inefficient way of conducting transactions, and the amount of energy that’s consumed in processing those transactions is staggering,” the former Fed chairwoman said. Yellen’s comments have been cited as a reason for bitcoin’s recent losses. However, Yellen’s assessment of bitcoin as a inefficient medium of exchange is an important point and one that has already been raised in the past by bitcoin bulls. Using a volatile asset in exchange for goods and services makes little sense if the asset can tumble 10% in a day, or surge 80% over the course of a two months as bitcoin has done in 2021, critics argue. To put a finer point on it, over the past 12 months bitcoin has registered 8 corrections, defined as a decline from a recent peak of at least 10% but not more than 20%, and two bear markets, which are defined as falls of 20% or more, according to Dow Jones Market Data.
科技圈的日常 from us