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Gav1n

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Gav1n
What's special about the colour yellow that makes it harder to see against a white background than the other primary colours?
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Gav1n
Can anyone think why there's no interchange between the Hammersmith&City/Circle/Metropolitan line and the Northern/Victoria line at Warren Street? If you look at the map...
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Gav1n
I have noticed that some of the flourescent tubes used to light train carriages on the District Line have dark spots moving down them. The speed and distance between the spots varies between...

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