The Truth Set Them Free
Injustice in Perugia
A site detailing the wrongful conviction of Amanda Knox & Raffaele Sollecito
The truth about the scream
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We need to examine the reality of sound travel to better understand if it was even possible for Nara to hear a scream coming from Meredith's room.
Here are some examples of sound.
129dB Guinness world record human noise
120dB Short term exposure causes hearing damage
100dB Chain saw
90 dB lawn mower
60 dB normal conversation/television
30 dB whisper
15 dB leaves rustling or calm breathing.
36 M or 118 ft from Nara's window to facade (further to back of house)
Sound pressure falls by 6dB every time the distance is doubled (this is scientific law)
3ft doubled to 6 ft = -6db loss
6ft doubled to 12 ft = -6db loss
12ft doubled to 24 ft= -6db loss
24ft doubled to 48 ft= -6db loss
48ft doubled to 96 ft= -6db loss
Total loss from distance = -30db
Interior of cottage = -25db
Nara's Double glass = -34 db
Cottage cheap glass =-27 db
Total sound loss from Meredith's scream to Nara's Window = -116 dB
World record scream = 129db
Grand total = 14 db
Other aspects to consider.
First concrete wall -db?
Second concrete wall -db?
Local traffic -db?
Landscaping -db?
Merediths door closed -db?
We haven't even finished the calculation and we have Nara's blood curdling scream down to lower than the level of a whisper. This doesn't take into account any of the aspects above. We are also basing the calculation on the Guinness world record for human noise. I am sure Meredith would have screamed as loud as world record sound if she could have, but it isn't very probable that she did.
There is no way that Nara heard a scream come from Meredith's room. This distance was simply too far.
The scream was allegedly so "blood curdling" that Nara did not bother to look at the time or call the police.
Nara may have had good intentions. She was simply trying to help the police after all. Maybe she was coached just a little bit. Science proves that she didn't hear a scream. Someone convinced her that she did.
Can we still look at Nara as a credible witness? I would say no.
Maybe she heard footsteps, maybe not. We will never really know. Nara simply isn't reliable.
