TIL that in 1978, a Manhattan skyscraper (Citicorp building) was found to be at risk of collapsing in a strong wind. It was secretly strengthened/welded back together at night for 3months while people worked inside during the day. The public didn't find out for 17yrs
#3 現在の順位Reddit・todayilearned 9月12日 16:00 UTC
プラットフォーム熱度11575元ソース指標
AI要約
1978 Citicorp building wind vulnerability secretly fixed over 3 months.