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7:35
Long-form
Why were traffic lights invented?
United States
Published February 24, 2022
Views
595K
|
Likes
1.04K
|
Comments
0
Views
#809,071
Global
Views
#182,488
United States
Live count
Channel
Mystery Science
1.03M
subs
•
270
videos
•
Apr 2017
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Views gained (weekly) · 6 mo
Likes gained (weekly) · 6 mo
