premise: Keith Martin (1969 or 1970 – December 5, 2014), one of the world heaviest lived people, was famous for being at one point the UK’s heaviest man, weighing approximately 980 lbs at his peak. Keith Martin was given a gastric bypass operation by the NHS, and had lost over 50% of his body weight.
hypothesis: Keith Martin died less than 20,000 seconds ago.
reason: He died almost 5 years ago and 20,000 seconds is not even 6 hours. It's difficult because I used 20,000 seconds as the measurement.