Testing Time: Quantum physicists Fabrizio Piacentini and Laura Knoll discuss their recent experiment testing the predictions of Constructor Theory, a new meta-framework of physics that may encompass all other theories. The new framework could solve the mystery of why time marches in only one direction, even though the microscopic laws of physics are reversible. With Logan Chipkin

Happy Higgs-versary! Particle physicist Kevin Black tells Zeeya Merali about the LHC's new quest. Also, time-travel at the LHC, an update on the W Boson tests with Frank Wilczek; Catalina Curceanu on testing the origin of consciousness; & Queensland physicists are building quantum clocks.

The End of Everything: Astrophysicist Katie Mack on her book describing ways to destroy the universe, & on hints of new physics at the LHC; a quantum engine that heats & cools simultaneously; how the thermodynamic gradient may have driven the evolution of intelligence through culture; & the UK's physics of life network.

'Quantum dots' can teach us about thermodynamics in the nanorealm.

Time's Arrow: A conversation with Paul Davies about time's irreversible flow, black holes, memories of Stephen Hawking and the information paradox, Maxwell's demon and living systems -- and how to improve universities. With Logan Chipkin.

Quantum Steampunk: Physicist Nicole Yunger Halpern talks about her new book on quantum thermodynamics, temperatures below absolute zero, and the physics of yesterday's tomorrow.

Constructor Theory and Irreversibility: A conversation with Chiara Marletto and Vlatko Vedral on a novel unification between information theory and thermodynamics and their recent experiment that tested, and corroborated, the constructor theoretic notion of irreversibility. With Logan Chipkin.

Eerie quantum Aharanov-Bohm effect demonstrated for gravity; mysteries about the nature of time; how choices can curve spacetime; and the Science of Can and Can't.

Information as Fuel. Quantum physicist Natalia Ares describes her quest to test thermodynamics in the quantum realm with carbon nanotubes. Philosopher Owen Maroney and theoretical physicist Janet Anders explain what such experiments can teach us about the foundations of physics and biology.

2021: The Year in Physics Review Part 3. FQXi's annual countdown of the physics highlights concludes, with quantum physicist Ian Durham.