A Boeing 787 Dreamliner is among the fastest and most fuel efficient passenger planes in the world today. But for many passengers, the most amazing thing about the Dreamliner might be the windows. With the press of a button, passengers can change the window pane from clear to opaque, blocking light as if lowering a window shade. Flight attendants can also control the window's opacity, "lowering the shades" without needing to disturb passengers. A Dreamliner doesn't need pull-down shades because the optical properties of its windows change in response to an electrical current.

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