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Humans are also hard wired to spot red within crowds, for example early human scavengers will spot fruits and berries in forest judging by their colour, this also ties into the fact that some fruits and berries turns red when they are ready for consumption. Plus guys tends to dig the colour red cause it's also one of the signals we get from women who are showing they are sexually active. That's like 2 reasons why red is usually a colour that catches our attention the most for both males (the sex thing) and females (the scavenger thing).
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