When was the last time you actually saw the Milky Way? For most people on Earth, that memory is tied to a remote vacation, not a regular night at home. The orange dome of urban light pollution has erased the stars from view for two-thirds of humanity, and the consequences run far deeper than aesthetics. This episode is a deep dive into how artificial light at night (ALAN) is rewiring biology, ecology, and human health.

We unpack the science. Light is not a single thing, it is a dosage of specific wavelengths. The blue-rich emissions of LEDs and screens are a particularly potent suppressor of melatonin, scrambling circadian rhythms in ways linked to higher rates of breast and prostate cancer in shift workers, metabolic disease, depression, and chronic insomnia. We also cover the strange "skyglow" phenomenon, the gas-station lit-floor  ...