Human and Shark Bite Force

Is this site complete bullshit?

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Is that complete bullshit? I mean humans have 100-150 PSI in Bite force while apparently they say great white sharks only have 669 PSI Bite force? I find it hard to believe a human have 1/4 the Bite Force of a 1.5 ton huge shark who casually makes holes in humans with snaps.

@elderskaar: sharks mouth is ALOT bigger sp the PSI will obviously be lower