There have been lots of posts lately about the $3.5M pledge from Peter A. Thiel, co-founder and former CEO of PayPal to the anti-aging research Methuselah Foundation.  Here today mamalian hibernation may be able to be triggered with hydrogen sulfide gas.  It is unclear if this state can last for years but it does seem as if it could be applied to humans (subjects invited).  Mark B. Roth of the Fred Hutchinson Cancer Research Center reported in Science that the induced hibernation state had enormous slowing of all metabolism and biological activities– suspended animation may be closer than we think.