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 当前排名Reddit · todayilearned 9月12日 UTC 16:00
平台热度11575原始平台指标
AI 摘要
1978 Citicorp building wind vulnerability secretly fixed over 3 months.