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High skill migrants (e.g #H1B visa holders) are an engine of economic growth & innovation. Don't believe me? Here is a thread with some stats...
1. High skilled people are more prone to migrate, so they are hard to get an easy to lose... Image
2. About 40 percent of Fortune 500 companies in America were founded by immigrants or their children.
3. Immigrants account for half of the founders of America’s unicorns.
4. Since 1970, more than 60 percent of U.S. Nobel Prize winners were immigrants.
5. Immigrants who came to America for study or employment are more likely to file a patent, publish a scientific paper, start a company, and earn higher wages than are American-born college graduates.
(source for 1-5: amazon.com/Gift-Global-Ta… )
6. Migrants in the US are only 13.4% of the total population, but they represent 26% of those with a PhD and 58% of the people in the US with a PhD in Computer Science

Pop: datausa.io/visualize?grou…
PhD: datausa.io/visualize?grou…
PhD CS: datausa.io/visualize?grou… ImageImageImage
High skilled migrants are THE engine of job creation. As a naturalized citizen, and a former H-1b visa holder, I've seen this first hand (I've been at Harvard & MIT for +11 years, H-1b is essential sustaining the knowledge economy).
I understand the need to appeal to those who don't understand how knowledge flows power the economy, but those who may celebrate this ill thought policy will also be the ones who suffer its consequences. /END
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César A. Hidalgo
@cesifoti
While people's general understanding of physics is a jump from Newton to Einstein, it is important to understand that there are some very clear intermediate steps. Here, I want to focus on a huge one: Lagrangian and Hamiltonian mechanics (1/N)
Newton's greatest hit was his three laws of motion.
1. Inertia.
2. F=ma.
3. Action and reaction.
The key here is the second law, which allows you to write equations for the motion of things. For a spring ma=kx. For a falling rock ma=mgh.
Newton's equation allows you to connect the acceleration of an object (a=ẍ) with its position (x). If you solve that equation, you get the position in time (x(t)). That's great, but what equation do you need to solve? How do you figure what goes after ma=...?
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César A. Hidalgo
@cesifoti
New Observatory of Economic of Complexity!!!
(oec.world).
We rebuilt the OEC from scratch with dozens of new datasets & features (Thread).
1. Let's start with ECI rankings.
The 2018 rankings show the rise of Asia, with Japan, Taiwan, Korea, & Singapore in the top 6
For the first time, we also provide ECI rankings using a number of different datasets and revisions (eg HS92, HS96, etc.), and provide the opportunity for users to build rankings dynamically using the custom rankings tool: pro.oec.world/en/rankings/cu…
2. We introduce a number of new profiles (now called reports). Not only we have profiles for countries, and products, but for pairs of countries (e.g. US-China), subnational regions (e.g. Hubei, Quebec, Tokyo), & Country-Products.
Read 11 tweets
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César A. Hidalgo
@cesifoti
Last Thursday the US had a historic moment, Chile had a similar moment in 2019. The events are not directly connected but follow a similar 8 step script:
1. Once people are in the streets, we will see increasing images of ...
of both vandalism and police violence. (Happening)
2. The right will dismiss the people on the streets as professionally organized external actors (happened)
3. The increasing use of tear gas and rubber bullets would become a heated discussion. (Starting)
4. Police reform will become “the” topic (to happen).
5. Some city locations will become recurrent grounds of confrontation (not yet happened in the US).
6. People will demand authorities to take sides & condemn either police violence or riots (not protests). (Starting)
Read 5 tweets

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