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Everyday Signs Or Items No One Knows The Meaning Of
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Why do many ballpoint pen caps, like those from BIC, have a hole at the top?
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Hint
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50-50
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Audience
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A
To equalize air pressure and prevent ink leaks
B
To create a whistling sound
C
It's a manufacturing byproduct
D
To reduce the risk of suffocation if swallowed
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