We’ve been testing your #MachineLearning knowledge, now let’s see what you know about #OpenScience. Drop your answers in the replies as we get ready for the launch of APS Open Science — accepting submissions in February.

🎉 Congratulations to the 2025 recipients of APS Innovation Fund grants. They’re exploring ways to expand #ClimateScience education and public engagement in the classroom, the planetarium, and virtual worlds. Learn more: https://t.co/CqCUpdoVL3

Why guess when you can know?

Thanks to the generous support of our physics community, we raised $26,395 on #GivingTuesday. Your gifts empower physics students to pursue scientific discovery. Haven’t given yet? There’s still time to make an impact with a gift of any size: https://t.co/NejrSQmTWl

Scientists have tracked a molecule breaking apart in real time. Using ultrafast x-ray scattering, they watched electrons move and hydrogen atoms shift in ammonia as it absorbed light — capturing the reaction with unprecedented resolution. Read the paper in @PhysRevLett:

🎉 Congratulations to Francis Halzen — the winner of our 2026 APS Medal for Exceptional Achievement in Research. He’s recognized for his work discovering cosmic neutrinos as the principal investigator of @uw_icecube. Read more from Halzen in #APSNews: https://t.co/VUOKL1jCNB

By coupling a maximal randomness principle with a law of conservation, a @PhysRevLett study universally describes the fragments that form when objects as diverse as ceramics, plastics, dry spaghetti, and bubbles under ocean waves break apart. Read more: https://t.co/xqRZHLibNM

🚨 Last call for APS CU*iP 2026 applications. The deadline has been extended to Dec. 8. Apply for this two-day conference in Denver, featuring research presentations, career-focused sessions, and opportunities to connect with the physics community: https://t.co/BzTN2Dblmm

The most exciting work in #AI and #physics demands a journal that understands both — and reviews both rigorously. We’re launching a new journal to meet that need: PRX Intelligence. Sign up for updates, including when submissions open: https://t.co/QTw2H1Hlf8

🥳 Congratulations to long-time member, APS Fellow, and @PhysRevB editorial board member Igor Herbut on his win!

For the first time, qubits have hit the Leggett-Garg bound of three. Using nuclear spins in a three-spin molecule under an 11.7 T field, researchers applied a superposition of time evolutions, achieving resilience to decoherence. Read more in @PhysRevLett: https://t.co/a4LGKmA41k

📣 Announcing APS Open Science — a new open access journal to expand global participation in trusted #physics research. Submissions open in February. Learn more: https://t.co/ERHQtDyMuQ

This #GivingTuesday, you can help us ensure physics students can pursue scientific discovery. Every dollar is matched up to $10,000. Unite for physics students by doubling your impact: https://t.co/NejrSQmTWl

A @PhysRevLett study uses #OpticalTweezers to trap and add charge to individual silica particles — revealing the electric evolution of particles similar to those in thunderclouds, which could help scientists understand what sparks lightning. ⚡ Read more: https://t.co/ZnheNCpbpz

Thermodynamics gets weird at the microscopic level: megakelvin temps, huge temperature and efficiency fluctuations, and position-dependent diffusion — a key process in chemistry and biology. Read the study in @PhysRevLett: https://t.co/J5tmFf9XOW

Deborah Armstrong turned a last-minute teaching assignment into a 20-year journey of hands-on #physics innovation. Now the 2025 PhysTEC Teacher of the Year, she’s inspiring students — and teachers — across the country. Read more in APS News: https://t.co/ypDeD1iZt7 @TheAAPT

A new study in @PhysRevLett reports the first measurement of the opacity of oxygen — one of the sun’s most important elements for radiation transport — at temperatures and densities approaching that of the sun. Read the paper: https://t.co/JXialWZH7j

APS student programs, grants, and career development opportunities are shaping the next generation, and they need our support. Make a gift this #GivingTuesday season to help students thrive: https://t.co/NejrSQmTWl

Particle #physics once relied mainly on accelerators and theory. But discoveries like the Higgs boson show that progress now requires a “big tent” of people and ideas. #NASmember Michael Turner and Maria Spiropulu explore this shift in @APSphysics News:

Cooling neutron stars might help test a possible fifth force of nature. A new study in @PhysRevLett uses older stars to probe how hypothetical scalar particles could couple to matter — tightening constraints by six orders of magnitude. 🔗 https://t.co/D2GKCsS7qi

Correct answer is C!