Part 4/10:
One of the most puzzling concepts in quantum mechanics is entanglement, a phenomenon where particles become interconnected such that the state of one affects the state of another, regardless of the distance between them. This challenges classical ideas of causality, which depend on a temporal sequence of events, suggesting that our understanding of reality is deeply flawed.
Recent theories propose that time itself may emerge from quantum entanglement. The Page-Wootters mechanism, for example, suggests that within an entangled system, time emerges through the correlations between subsystems, allowing one part of the system to function as a clock. Without this entanglement, the universe would seem static, challenging the notion of time as a fundamental entity.