Healthy blood oxygen at sea level runs 95–100% on a pulse oximeter. At cruise, cabin pressure equivalent to 6,000–8,000 feet drops the average passenger to about 93% (individual readings as low as 85%). Clinicians treat saturations under 90% as abnormal…

Across the full Harvard Flight Attendant Health Study cohort of female flight attendants, breast cancer incidence showed no significant link to absorbed cosmic radiation, hours worked during the standard sleep interval, or time zones crossed. The occupational signal surfaces only…

Don't wash your face with airplane tap water. The same tanks that feed the galley coffee and tea also feed the lavatory sink, and splashing that water toward your eyes, mouth, or broken skin is the risk that matters —…

No — there is no single federal law requiring airlines to disinfect aircraft water tanks exactly four times a year; the Aircraft Drinking Water Rule instead requires each airline to follow an FAA-accepted operations and maintenance plan, which sets disinfection…