It must also affect tourism. It's expensive buying health insurance to visit the US, which we get even if going for a day. And soon I'll be too old to get any at all. The fear of getting sick or injured while in the US is a serious concern for travelers.
I prefer a Redditor's answer: The ballast from an old fluorescent light transformer is starting to hum (it only moves when the light is on). The statue's base may be a bit convex, allowing a rotation point.
http://arstechnica.com/information-technology/2013/07/us-agency-baffled-by-modern-technology-destroys-mice-to-get-rid-of-viruses/
A German invention?