Summary in Seconds: A bold cosmological theory suggests that our universe may have a mirror “anti-universe” born at the same moment as the Big Bang but moving backward in time. Based on the principle of CPT symmetry and developed by physicists including Neil Turok, this idea proposes a perfectly balanced cosmic pair—our universe dominated by matter, and a twin dominated by antimatter [1]. The theory could explain major mysteries like dark matter—possibly made of invisible right-handed neutrinos—and may even eliminate the need for cosmic inflation, offering a simpler and more symmetrical picture of the universe’s origin. Though still unproven, future