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    Our guiding principles
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    Addressing emerging challenges for the physics enterprise
  - Our history
    Learn about our first 125 years
  - Our ethics
    APS strives to model truth, integrity, and respect within the physics community
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    Meet our volunteer and staff leadership
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- Work at APS
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- Publications
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    Coverage of the physics community
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    In-depth studies on physics topics that affect national policy
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- Publish with APS
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- Communities
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- Resources
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  - Code of conduct
    Creating a respectful atmosphere for all attendees
- APS Global Physics Summit 2025
  Revisit your favorite presentations and explore new physics research with recorded sessions through June 19.
  Access on-demand content
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    Advancing the physics community's policy priorities
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- Careers and mentoring
  - Find a job or internship
    Search hundreds of jobs in physics
  - View all career resources
    APS supports physicists and other scientists from the beginning of their education to every stage of their careers.
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- Preparing physicists
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    Resources to build and sustain healthy programs
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    Teacher resources, lesson plans, and information about physics
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- Physics for everyone
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- A welcoming global hub
  - International engagement
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- Impacted scientists
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The Twin Paradox, Redux

Archives

The Twin Paradox, Redux

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