system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How does radiation from cell phone towers go through walls but doesn't affect humans?
gpt
Because it's radio waves.

Radio waves are, as far as most of the electromagnetic spectrum is concerned, very long wavelength. Even the smallest wavelengths used by phones (1-10mm) are still much larger than a human cell. As a comparison, X-rays have a wavelength of 0.01–10 nm (1mm  = 1,000,000nm).

Very small wavelengths are dangerous to humans and animals because they are small enough to meaningfully interact with our DNA. A bigger wave basically just goes right past us without ever doing anything simply because our sensitive biology is too small for it to interfere with.