I've been getting curious lately about why various comic books and also this site claim that peak human strength is the ability to dead lift 600 lbs, so I went and looked it up. Imagine my surprise when I found out that the deadlift record is just a hair over 1,000 lbs. Which brings me to my question. Is there a particular reason that the "peak human" strength is 400 lbs short of actual peak human strength?