#播客
虽然从来没打过网球，也没看过完整的网球比赛，但是我觉得网球这项运动区别于其它运动最特别的一点是：一旦运动员上场比赛，中间就不能再获得教练的帮助，要自己独自面对场上发生的一切情况。所以李娜的自传书名是《独自上场》。
实际上，不止于网球，很多事情上我们都是“孤独”的，需要随时做好“独自上场”的准备。“独自上场”，才是生活的常态。
前几年听过张潇雨的播客《网球（上）——孤独和它所创造的》，专门介绍网球这项运动，这次奥运会想起来这期节目，只可惜好像这期节目没有下半段了。
这期播客里提到的《The Inner Game of Tennis》（中文《身心合一的奇迹力量》），多抓鱼上一直买不到。
BY codedump的电报频道
Bitcoin is built on a distributed digital record called a blockchain. As the name implies, blockchain is a linked body of data, made up of units called blocks that contain information about each and every transaction, including date and time, total value, buyer and seller, and a unique identifying code for each exchange. Entries are strung together in chronological order, creating a digital chain of blocks. “Once a block is added to the blockchain, it becomes accessible to anyone who wishes to view it, acting as a public ledger of cryptocurrency transactions,” says Stacey Harris, consultant for Pelicoin, a network of cryptocurrency ATMs. Blockchain is decentralized, which means it’s not controlled by any one organization. “It’s like a Google Doc that anyone can work on,” says Buchi Okoro, CEO and co-founder of African cryptocurrency exchange Quidax. “Nobody owns it, but anyone who has a link can contribute to it. And as different people update it, your copy also gets updated.”
Like a stock, you can buy and hold Bitcoin as an investment. You can even now do so in special retirement accounts called Bitcoin IRAs. No matter where you choose to hold your Bitcoin, people’s philosophies on how to invest it vary: Some buy and hold long term, some buy and aim to sell after a price rally, and others bet on its price decreasing. Bitcoin’s price over time has experienced big price swings, going as low as $5,165 and as high as $28,990 in 2020 alone. “I think in some places, people might be using Bitcoin to pay for things, but the truth is that it’s an asset that looks like it’s going to be increasing in value relatively quickly for some time,” Marquez says. “So why would you sell something that’s going to be worth so much more next year than it is today? The majority of people that hold it are long-term investors.”
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