On or around 21 Dec 1999 there was a message from 'Frank' asking for the = above. Recommend you look at 'Vibroacoustic disease: the need for a new = attitude towards noise.' by Mariana Alves-Pereira & Nuno Castelo Branco, = CITIDEP 2000. on the net. They found suicidal tendencies and a lot more serious stuff besides. This is a major issue for all industrialised countries; my own research = suggests that the estimated 100,000 per annum deaths from DVT syndrome = in airline passegers is linked to prolonged exposure to infrasound = generated by jet engines (25-30 Hz exhaust resonance transformed into a = passenger compartment resonant air pressure oscillation at around 6 Hz). Regards, David CollierOn or around = 21 Dec 1999=20 there was a message from 'Frank' asking for the above.Recommend you look at 'Vibroacoustic = disease: the=20 need for a new attitude towards noise.' by Mariana Alves-Pereira & = Nuno=20 Castelo Branco, CITIDEP 2000. on the net.They found suicidal tendencies and a = lot more=20 serious stuff besides.This is a major issue for all = industrialised=20 countries; my own research suggests that the estimated 100,000 per = annum=20 deaths from DVT syndrome in airline passegers is linked to prolonged = exposure to=20 infrasound generated by jet engines (25-30 Hz exhaust resonance = transformed into=20 a passenger compartment resonant air pressure oscillation at around = 6=20 Hz).Regards,David = Collier