In case you hadn't seen this:
From the AdventureCORPS site:
"Furnace Creek 508 was recognized as one of the world's ten toughest races by National Geographic Adventure Magazine this year. It's sister event, also held in Death Valley and also hosted by AdventureCORPS, the Badwater Ultramarathon, was noted as THE toughest."
I thought it was really cool to have a third party confirm how tough the Furnace Creek 508 is in the vast world of extreme sports.