System IDLE Time > System Uptime?

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http://unix.stackexchange.com – I was testing out the linux api while working on something but got stuck on the following output. [Abhii@localhost net]$ cat /proc/uptime 39135.53 149657.73 As per specs the first number should be the Uptime and the second number should be the time system has stayed idle. So why is the former less then latter ??? As an extra piece of info my version information Linux version 3.5.2-3.fc17.x86_64 (mockbuild@) (gcc version 4.7.0 20120507 (Red Hat 4.7.0-5) (GCC) ) #1 SMP Tue Aug 21 19:06:52 UTC 2012 (HowTos)