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Related Concept Videos

Migration00:53

Migration

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Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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Related Experiment Video

Updated: May 15, 2025

Quantitative Analysis of Random Migration of Cells Using Time-lapse Video Microscopy
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Measuring global migration flows using online data.

Guanghua Chi1, Guy J Abel2,3, Drew Johnston4

  • 1Meta, Menlo Park, CA 94025.

Proceedings of the National Academy of Sciences of the United States of America
|April 29, 2025
PubMed
Summary
This summary is machine-generated.

New data from 3 billion Facebook users provides reliable, real-time global human migration estimates. This research offers timely insights into international population movements, crucial for policy and humanitarian efforts.

Keywords:
human migrationinternational migrationmigration flow

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Area of Science:

  • Demography
  • Computational Social Science
  • Data Science

Background:

  • Existing human migration data lacks scope, reliability, and timeliness.
  • International organizations like the UN and Global Compact on Migration advocate for enhanced data collection methods.

Purpose of the Study:

  • To develop a novel method for estimating country-to-country human migration flows.
  • To provide near real-time, worldwide migration data with monthly granularity.

Main Methods:

  • Utilized privacy-protected data from three billion Facebook users.
  • Developed a model to estimate migration flows, accounting for Facebook user selection bias.
  • Validated estimates against high-quality existing migration data.

Main Results:

  • Estimated 39.1 million international migrants in 2022 (0.63% of the sample population).
  • Observed a 64% decrease in migration during the COVID-19 pandemic, followed by a 24% increase above pre-crisis rates in 2022.
  • Documented a tenfold increase in migration from Ukraine post-Russian invasion.

Conclusions:

  • Privacy-protected social media data offers a scalable and timely solution for global migration estimation.
  • Migration patterns are dynamic and significantly impacted by global events like pandemics and geopolitical conflicts.
  • Public release of these estimates via Humanitarian Data Exchange supports research and policy interventions.