The image is almost universally recognised. Someone is convinced that invisible signals are being beamed into their head, so they reach for the ultimate piece of improvised technology: the tin foil hat. It has become a symbol of conspiracy theories and paranoia. But underneath the joke is a legitimate physics question. Would wrapping your head in aluminium foil actually protect you from radiation? The surprising answer is: for some electromagnetic radiation, metal shielding can work extremely well. For other types, it would do virtually nothing. And the difference comes down to what "radiation" actually means. Radiation isn't one thing The word radiation can sound alarming because it covers an enormous range of phenomena. Visible light is radiation, radio waves are radiation, microwaves are radiation, infrared radiation is radiation. X-rays and gamma rays are also radiation. They are all forms of electromagnetic radiation, but they have enormously different energies and f...
Follow the Clues. Challenge the Narrative.