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How one design flaw almost toppled a skyscraper
Lesson duration 05:16
813,942 Views
1,415,886 Views
Debunking the myth of the Lost Cause: A lie embedded in American history
Lesson duration 04:43
1,864,939 Views
1,326,663 Views
530,200 Views
2,975,949 Views
986,242 Views
1,016,832 Views
3,398,276 Views
518,516 Views
Why are airplanes slower than they used to be?
Lesson duration 04:59
2,328,716 Views
313,380 Views
339,283 Views
584,491 Views
2,407,190 Views
3,721,152 Views
587,594 Views
1,311,813 Views
548,269 Views
412,239 Views
447,951 Views
11,577,963 Views
536,901 Views