Because it remains a mystery what wavelengths are liable to be interfered with. Because it is extremely dangerous to conduct such research on an airplane. Because research scientists have not been able to produce the same effects in labs. Because experts lack adequate equipment to do such research.
He is depressed because of the ignorance of scientists. He is doubtful because of the enormous difficulties in scientific research. He is confident though he is aware of the enormous difficulties in scientific research. He is delighted because of the illuminating scientific findings.
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