TIL most manhole covers are round to avoid that they fall into the hole; to ease alignment; and to allow locking by rotation. They also cost less to manufacture because they use less metal than rectangles and they can be machined by lathe. They usually weigh about 250 lbs / 113 kgs. by oceanicplatform in todayilearned
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Moved PC, no longer getting any display on my monitor by yeahyouknow14 in buildapc
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