Why do whistles have a little ball inside them? - https://old.reddit.com/r/NoStupidQuestions/comments/60mfwp/why_do_whistles_have_a_little_ball_inside_them/
Why do whistles have a little ball inside them? - https://old.reddit.com/r/NoStupidQuestions/comments/60mfwp/why_do_whistles_have_a_little_ball_inside_them/
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