Quantum Breakthrough. If we think about the gentle from a laser pointer, it exits the tip of your laser pointer and moves in the straight line until eventually it hits an obstacle and scatters (or hits a mirror and bounces). Bell developed an equation now generally known as Bell's inequality https://neptunedirectory.com/listings12762878/quantum-error-5-tips-about-quantum-leap-season-2-you-can-use-today