Rule of 72

This is interesting. Say, if I have $100, and the saving account rate is 2%. Assuming compound interest, how long does it take to double the money? An easy way to estimate that is to simply calculate: 72 / 2, which is 36. So it will take 36 years to double my money. Really? Let’s see… 100 * (1+0.02)^(36) = 100 * 2.0398… = 203.98 !!! WTF !!! How about SPY? Based on trailing 10-year data, the fund generated average annual returns of 11.04%. So how long does SPY take to double my money? 72 / 11 = 6.54. ...

May 20, 2020 · 1 min · birdchan

Covid-19 tests

Apparently there are 3 types of Covid 19 tests. 1. Nucleic acid amplification tests ( molecular tests) - also known as genetic, RNA or PCR tests. 2. Antibody tests - also known as serology tests. 3. Antigen test Diagnostic or PCR test. This is the one with the long stick getting mucus from your nose. Even though it takes a few days for the virus to replicate in the nose, this method is so far the most reliable one. ...

May 15, 2020 · 1 min · birdchan

Wordpress hosting on AWS

I am glad my blog is on wordpress.com. Seems like there are better ways now (not necessarily easy): https://aws.amazon.com/getting-started/hands-on/launch-a-wordpress-website/ https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/php-hawordpress-tutorial.html

April 21, 2020 · 1 min · birdchan

Unemployment

The number of Americans who applied for unemployment benefits last week rocketed to a record 3.28 million Why is the market still going up? Don’t fool me. People don’t have jobs, government is printing money, where are we going? This is probably just the first wave of unemployment numbers, wait until the next wave. Link: https://www.marketwatch.com/story/a-record-328-million-americans-applied-for-unemployment-benefits-last-week-due-to-coronavirus-2020-03-26

March 26, 2020 · 1 min · birdchan

Social distancing?

Would social distancing work? The available hospital beds line is way down there. I kinda understand now why China built new hospitals in 7 days and locked down cities. It was really to minimize casualties. Social distancing could only delay the spike. I wonder if we spent the trillion dollars to pay everyone to stay home instead, would that be a better alternative. ...

March 26, 2020 · 1 min · birdchan

COVID-19 in US and Canada

https://coronavirus.1point3acres.com/ IMG-7312 IMG-7313 Other links: Coronavirus COVID-19 Global Cases by the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University (JHU) https://www.tradingview.com/covid19/ https://covidactnow.org/state/WA https://informationisbeautiful.net/visualizations/covid-19-coronavirus-infographic-datapack/?from=groupmessage&isappinstalled=0

March 20, 2020 · 1 min · birdchan

Street Fighters

We had this before Super Smash Bros. https://youtu.be/yMLt6KetIXU

March 19, 2020 · 1 min · birdchan

Pulse Oximeter

For SpO2 value: A normal healthy person should be able to achieve normal blood oxygen saturation levels (SpO2) of 94% to 99%. For patients with mild respiratory diseases, the SpO2 should be 90% or above. For heart rate: a normal range for adults is 60 to 100 beats per minute, according to the Mayo Clinic. A well-trained athlete may have a resting heart rate of 40 to 60 beats per minute. ...

March 16, 2020 · 1 min · birdchan

疫期生活方式指导

《海外子女自我免疫保护方法》和《疫期生活方式指导》 小宝儿: 疫情如果到美国,你们要注意:欧美社会治理能力比中国弱,国 内疫情虽重,但政府治理能力强,很有社会主义的优势和特色。 老爸在国内刚刚经历了长时间的封闭式生活,积累了很多经验。 自由、民主、个人化,是美国社会的特征,但在面对重大突发危 机事件是,这绝对是劣势。 所以,如果美国疫情加剧,以下经验,你们俩都务必要注意—— 储备口罩,手套,眼镜,消毒喷剂……这些都是最基本的。 除此之外,自身的免疫力高于一切!!!关于储备食物和饮用水和 生活方式方面,要注意—— 1,【免疫力第一】:你们要记得:就算在国内、在武汉,即便有 疫情,其实大多数人的免疫力是可以扛过去的。 健康的真理,既不是保健品,也不是拼命而过度的防护……而是 免疫力+抵抗力。 2,【储备基本饮食】储备防疫物资和食品,不要忽略最基本食材、 最基础食材,比如说:面粉、大米、鸡蛋、油盐酱醋、干面包、 咸菜、发酵过的酱菜。 因为这些东西能放很久,工业化食品、冷冻食品、成品、半成品…… 的储藏和储备都受时间限制。太娇气的食物,不适合做储备。 3,【水果和蔬菜】:水果蔬菜必须要储备,因为人如果没有了维 c 和综合维生素,免疫力下降最快,但它们并不容易储藏。所以 不要储备绿叶菜、浆果类水果。要储备苹果、土豆、洋葱……等 储藏时间比较长,不太容易变质的蔬菜水果。 宁可少吃米、面,也不能忽视水果蔬菜,维生素和微生物是免疫 力的基础。 4,【优质蛋白质】:冷冻储备一些肉是没办法的事情。但一定要 储备优质蛋白质肉类。比如说:虾、牛肉、羊肉、鲑鱼……少储 备普通鱼、猪肉、贝类。 5,【少喝饮料】:千万不要买太多饮料。如果费城的自来水可以 直饮,那就好。同时,多备一些矿泉水、纯果汁、酸奶、牛奶…… 除此之外的其他饮料都对人体无益。 6,【低强度高频率的运动】:运动强度太大是愚蠢的,一切运动 的前提都必须是有氧,太高强度的运动是消耗而不是健康。我看 你最近很喜欢健身,务必降低强度,提高频率。 在家健身,没必要专门买任何健身设备,那都是累赘和装模作样。 早晨起床空中登轮、定时深蹲、平板支撑、以自体重为哑铃的四 肢运动、呼吸与瑜伽……都很好,务必注意低强度、高频率。高 强度的无氧运动,对健康不利。 另外,【学会慢呼吸】:呼吸越慢、越深、越平稳,人的心肺功能 越好。 7,【多接触泥土和植物】:多接触泥土和植物,大都市里的人免 疫力的普遍下降的根本原因是【大规模水泥+柏油的覆盖】。 8,【充足的深睡眠】:和足够的睡眠温度。深睡眠的时间不仅要 够,而且睡觉时的温度不能低。出汗是健康,晚上睡觉宁可热的 出汗,也不要冷。 9,【多晒太阳】:尤其是晒后背,每天坚持有意识的出汗。 10,【善良自信】:自信、豁达、开阔、慈善、助人的心……积极 乐观、本质善良的心态,可以让人从骨子里身心健康。来自于内 心的免疫力,更加本质。 11,【多干家务】:提高整理家、收拾家、保持清洁吸尘除螨的爱 好。向日本人学习清洁力。 12,【停止内消耗食品】:停止烟、茶、咖啡、重口味食品……这 些东西都会增加内在消耗。不要喝所有洋酒,如果有条件就喝中 国的酱酒,咱家的酣客和茅台都可以,你在美国应该能买到茅台, 注意:少量喝酱酒,尽量加一些开水把酒精度稀释降度,如果加 一倍开水,那就是 26.5 度,这样就都能喝了,开水还可以释放 酱酒中残余的杂质,同时其中的微量元素和活性物质对于活血、 循环、提高心肺功能,很有好处。 13,【不要吃撑】:适当保持【轻微饥饿状态】,每顿饭最多吃 7 成饱。控制自己对食物的欲望,轻微饥饿状态的免疫力是最高的, 反应、头脑敏捷度也是最高的。 14,【多阅读】:精神生活更加重要。用好 kindle,多读书,如 果封闭隔离在家,千万不要停止精神和心灵的成长。疫情、封闭、 隔离,对一般人来讲是坏事,但对老爸来说“是天大的机遇和好 事”,因为它可以让你聚焦专注的解决一些【平时碎片化状态下】 难以解决的问题。所以我经常给同事和酣亲们讲“要珍惜疫情给 我们带来的机遇”。 ...

March 6, 2020 · 1 min · birdchan

Installing ngrok on OSX

You really want to try this if you all of a sudden have a localhost website to share to others but it’s troublesome to get onto the same network and lookup IP and stuff. To install ngrok, just run the following. More details here. [code] brew cask install ngrok [/code] Then have your localhost running. Here is a sample command to share your local directory. You can pick any port number. Let’s pick 8080 for example. ...

February 6, 2020 · 1 min · birdchan