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radio × 18electromagnetism × 6
history × 3
mobile-phones × 3
technology × 2
safety × 2
united-states × 1
politics × 1
physics × 1
law × 1
environmental-health × 1
cancer × 1
war × 1
military × 1
aviation × 1
russia × 1
terrorism × 1
dentistry × 1
music × 1
nuclear-weapons × 1
mathematics × 1
catholic-church × 1
racism × 1
school × 1
energy-efficiency × 1
