This blog explains what a light cone is (a spacetime cone defining causal limits, including past and future cones), its roles, importance in protecting causality and understanding the universe, and its life lesson: focus on your causal reach, accept the unchangeable past, and shape your future.
This blog explains the International Date Line (IDL)—an imaginary line along 180° longitude dividing today and yesterday, its necessity to avoid date chaos, and its life lesson: we can’t reverse the past, but understanding this line helps us take control of time and shape our tomorrow.
