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At take-off, inside an aircraft, having all lights off allows the passengers eyes to adjust to the actual level of light onboard.
Should an emergency occur theoretically passengers and crew reactions should be faster.
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Will lights in a series circuit will stay lit if one goes out?
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How can you check the headlight fuse is OK for a Clio 172?
flash your head lights or take the fuse out and make sure it ain't blown
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How much per bottle of liquid or cream can you take on a aeroplane?
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