I recall an article about engineers in either Africa or India where they calculated the structural integrity required to support up to 1000 people per floor max however they forgot to calculate the support required for the weight of the actual floor in addition to a people capacity.
NASA lost a Martian probe when the teams failed to convert the europeans stuff in metric to the rest of the project's English measurements.
That one gets even more hilarious. It was a fixable error, but since the bureaucracy wasn't followed correctly, nothing happened.
"The discrepancy between calculated and measured position, resulting in the discrepancy between desired and actual orbit insertion altitude, had been noticed earlier by at least two navigators, whose concerns were dismissed because they "did not follow the rules about filling out [the] form to document their concerns"."
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