Videos | Smithsonian feed for VideosenMon, 07 Dec 2015 22:54:13 +0000Why Doesn't the Willis Tower Topple Over? is home to one of the tallest buildings in the world: the Willis Tower. On a windy day, the topmost floors can sway as much as three feetMon, 07 Dec 2015 22:54:13 +0000Watch Highlights From the Smithsonian's "Age of Humans" Symposium on the science, economics and innovations of climate change spoke at this one-day event in Washington, D.C.Mon, 23 Mar 2015 19:05:21 +0000