Can airplane windows crack?
If you've ever looked outside the window on a flight and wondered how those little portholes keep from shattering, you're not alone. Fortunately, you most definitely will not be sucked out into the sky. The window is made from several layers of reinforced glass.
Why are lights turned off during landing?
The lights are dimmed during takeoff and landing in order to help your eyes adjust to the darkness in the event of an emergency. That way, if the power goes out, passengers aren't suddenly thrust into chaos, unable to search for an exit in the dark.