06-20-2017, 12:03 AM
(06-19-2017, 10:13 PM)guohua Wrote: I don't understand how he could have stuck his head in a Machine that is sealed tight and there is a vacuum in it.
Quote:With the first start-up of beams in 2008, the Large Hadron Collider (LHC) became the biggest operational vacuum system in the world. It operates at a variety of levels of pressure and uses an impressive array of vacuum technologies.
Source
That does beg an answer, doesn't it?