"At the quantum level, the past and the future are indiscernible. That could have profound effects on the world we can see." https://www.popularmechanics.com/preview/science/a64479213/quantum-arrow-of-time
https://screenrant.com/tenet-movie-nolan-inversion-reverse-time-travel-explained
https://screenrant.com/tenet-timeline-chronological-order-time-travel-inversion-explained/
https://en.wikipedia.org/wiki/Tenet_(film)#Plot
https://www.gq.com/story/tenet-explained
https://en.wikipedia.org/wiki/Tenet_(film)#Temporal_paradoxes_and_free_will
https://tobincorporated.com/tenet