Different RF bands are used in "aeronautical radio, navigation, broadcasting, and personal wireless communication services," according to EHS, while "specific frequencies are designated for industrial, scientific, and medical uses." Some reported hearing high-pitched sounds similar to crickets while at home or staying in hotels, leading to an early theory of a sonic attack. "However, as insecticides can increase the risk or severity of adverse outcomes after exposure to a wide variety of physical or psychosocial stressors, the committee cannot rule out subacute or chronic OP and/or pyrethroid exposures as a possible contributing factor to nonspecific chronic symptoms." The U.S. Embassy in Cuba is all but closed as a result of the illnesses, while diplomats experiencing similar symptoms stationed in China have had a hard time finding validation from the U.S. government. Most individuals reported that the sound or these other sensations seemed to originate from a particular direction and were perceived only when the individual was in a specific physical location.
0.1 lbs of air is needed to sustain the attacks.
( z0 need :ARG0-of ( z1 sustain :ARG1 ( z2 attack ) ) :ARG1 ( z3 air :quant ( z4 mass-quantity :quant 0.1 :unit ( z5 pound ) ) ) )
(z0 / need-01
    :ARG0-of (z1 / sustain-01
                 :ARG1 (z2 / attack-01))
    :ARG1 (z3 / air
              :quant (z4 / mass-quantity
                         :quant 0.1
                         :unit (z5 / pound))))
0.1 lbs of air is needed to sustain the attacks .
z4 :quant 0
z4 :unit z5
z3 :quant z4
z0 :ARG1 z3
z0 :ARG0-of z1
z1 :ARG1 z2